Below, check out the list of all the special songs she's brought to the Reputation Tour B-stage. Luckily, Swifties in the crowd have been quick to upload clips of these rare live cuts.
"All Too Well"
Glendale, Ariz., May 8; Pasadena, Calif., May 19; Arlington, Texas, Oct. 6
It's no secret among Swift fans that the emotional Red stand-out "All Too Well" is widely cherished. What better surprise to sprinkle into the set list on the opening night of tour, then? "I figured...I would play this song you seem to request more than the others," she said, introducing the beautiful tearjerker.
Santa Clara, Calif., May 11; Tokyo, Japan, Nov. 21
Swift once performed "Wildest Dreams" acoustic at a Grammys event, and she brought that raw, impassioned version of the 1989 song to the Reputation Stadium Tour B-stage twice -- first in Santa Clara, then on the final night of tour in Tokyo.
"The Best Day"
Santa Clara, Calif., May 12
On Mother's Day weekend, Swift gifted her mom -- and, apparently, tour opener Camila Cabello's mom -- with this touching ode to the mother-daughter memories they've made. The sweet Fearless track is one that is rarely performed live.
Pasadena, Calif., May 18
The Rose Bowl served as inspiration for Swift's B-stage surprise on her first of two nights at the venue. "Roses are red," she mused. Cue an acoustic take on "Red," the title track off of her 2012 album.
Seattle, Wash., May 22
"Holy Ground" is all about romanticizing the time you've shared with someone -- and an excellent selection to surprise an audience full of longtime, loyal fans with. "Tonight I'm gonna dance for all that we've been through," she sings. "But I don't wanna dance if I'm not dancing with you."
"Teardrops on My Guitar"
Denver, Colo., May 25
Swift's second single, released over a decade ago in 2007, is one she admitted she hasn't played "in 100 years." The singer-songwriter went back to basics with an acoustic performance of her song about unrequited high school love, and the crowd sang along to every sentimental word.
Chicago, June 1
Kicking it back to country, Swift surprised her fans on the Chicago B-stage with "Our Song," her third single off her debut album. Based on this clip, the classic from her canon had just about everyone singing along. Will she "play it again"?
Chicago, June 2; Foxborough, Mass., July 26; Sydney, Australia, Nov. 2
Swift's friend Martha Hunt says she's the one who suggested "22" as the surprise song on night two in Chicago, and Swift credited the enthusiastic crowd at her first night in Foxborough for her decision to perform it again. It's not every day that you get "22" acoustic, but Swifties got it three times so far on this tour, the most recent of which came during a rain-heavy performance in Sydney.
"I Knew You Were Trouble"
Manchester, England, June 8
It's unlikely that the Manchester crowd of Swifties did not know the lyrics to "I Knew You Were Trouble," but the pop star offered some advice anyway: "Even if you don't know the words, it's kind of easy to remember this one part." She led them in a practice round of the post-chorus "oh, oh!" and went on to deliver an acoustic rendition of the frenetic tune.
"I Don't Wanna Live Forever"
Manchester, England, June 9
Those who attended the second Taylor Swift stadium show in Manchester were in for a treat: a rare live performance of "I Don't Wanna Live Forever," Swift's 50 Shades duet with Zayn.
Dublin, Ireland, June 15
Playing "Mean" live is a sure crowd-pleaser, and Swift did just that at the first of two headlining shows in Dublin. Although the song was a mainstay back in her days touring in support of Speak Now and Red, this date marked the debut of "Mean" seeing the Reputation Stadium Tour stage.
"How You Get the Girl"
Dublin, Ireland, June 16
"If you want to sing along, that would be absolutely glorious," Swift encouraged the crowd at her second night at Croke Park. She then smiled her way through a rare, acoustic performance of the 1989 track.
"So It Goes..."
London, England, June 22
Reputation album track "So It Goes..." has been noticeably absent from this tour's set list, making Swift's surprise addition to her Wembley Stadium set all the more special. With this acoustic treat, she perhaps hinted at what the song sounded like when she first wrote it.
London, England, June 23
June 23 marked Swift's fifteenth show on the Reputation Stadium Tour, so what better song to play? The country-pop Fearless single was an early hit for her -- and based on the crowd's reaction, it's still holds a place in fans' hearts.
Louisville, Ky., June 30
The opening track of Speak Now wrapped the June leg of Swift's Reputation Stadium Tour. "I haven't played this song in so many years, and you're singing it so loud," she beamed from the B-stage.
Columbus, Ohio, July 7
Keeping in the tradition of Speak Now, Swift moved onto the pop-country album's second track at her next tour stop. The song, about a classic crush that's so clearly a "bad idea," was written when the singer was a teenager but held its own in a 2018 Taylor Swift set list.
"State of Grace"
Landover, Md., July 10
For the first of two nights in Maryland, Swift harkened back to the "golden age of something good and right and real" and the acoustic guitar beginnings of "State of Grace," the opening track on her Red album.
Landover, Md., July 11
The second Reputation Tour set in Maryland delivered a rare, understated performance of "Haunted," a Speak Now track that hasn't seen Swift's stage much since 2011/2012 -- back when she gave it a decidedly more dramatic treatment.
"Never Grow Up"
Philadelphia, Pa., July 13
Before strumming the chords of "Never Grow Up," Swift explained that she'd just gone back to visit the nearby farm where she had actually grown up. "I got especially emotional when I walked into my old bedroom," she admitted. She hinted she'd be playing the song with picture of herself in her childhood room on Instagram earlier in the day, and the performance that night took on an especially sentimental tone.
Philadelphia, Pa., July 14
After some technical difficulties that temporarily left Swift stranded at the main stage rather than floating in her cage over the crowd to the B-stage, she bestowed fans with a highlight from her Red album.
Cleveland, Ohio, July 17
A concert in Cleveland brought Swift's live debut of "Babe," the Red-era-turned-2018-country-single she penned (with Train's Pat Monahan) that got away -- er, was given away, to Sugarland for their latest album.
"Welcome to New York"
East Rutherford, N.J., July 20
It was Swift's first show in New Jersey on this tour, but she gave a little shout-out to its neighbor New York with her ode to the loud sounds, bright lights and new beginnings that the big city brings.
East Rutherford, N.J., July 21
There's somethin' bout the way a Taylor Swift show feels in the rain, or so they say. Singing in the rain, Swift happily performed the title track of her second album while dancing "in a storm in my best dress, fearless."
East Rutherford, N.J., July 22
During her third night at MetLife Stadium, Swift left fans "Enchanted" as they sang along to her acoustic take on the Speak Now track. First released in 2010, the song has rarely seen the live stage since 2011, when she was on her tour in support of that album.
Foxborough, Mass., July 27
At the second of three nights playing Gillette Stadium -- which is where Swift had her first-ever stadium concert, back on the Fearless Tour in 2010 -- the star of the show dedicated "Change" to a fan she'd met at her meet and greet. That fan had told the singer how much the song meant to her, and it just so happened that Swift had already been thinking of adding it into her set. The stars aligned on this Friday night as the crowd was treated to a song that hasn't been performed live in years.
Foxborough, Mass., July 28
Swift whipped out another rarity as the surprise B-stage song for her third and final show at Gillette Stadium: "Ours." This concert date marked her tenth time performing at the stadium, where she was also the first female to ever to headline three shows in a row.
"Out of the Woods"
Toronto, Aug. 3
For its tour debut, Swift introduced an emotional second bridge to her acoustic performance of 1989 standout "Out of the Woods." "Remember when we hit the brakes too soon?" she called out again. "Twenty stitches in a hospital room. You started crying, I did too."
"Come Back... Be Here"
Toronto, Aug. 4
Not only did Toronto get a surprise "Summer of 69" duet between Swift and Bryan Adams, but the crowd also got what was seemingly the singer's first-ever live performance of "Come Back... Be Here," an underrated Red album bonus track.
"A Place in This World"
Pittsburgh, Pa., Aug. 7
Swift surprised fans in her home state with a performance of her Pennsylvanian-written song “A Place in this World” -- a rare album cut from her 2006 debut album, Taylor Swift. This special throwback quickly become a favorite out of all the unexpected songs Swift has performed thus far.
Atlanta, Ga., Aug. 10
During the first of a two-night stint in Atlanta, Swift admitted it was the first time she'd ever performed an acoustic cut of "This Love," which she once said was the one 1989 track she kept listening "back to, over and over and over again." In the interview, the singer added, "It's kind of like hypnotic in a way, and it kind of is somewhat romantic and wistful and relaxing."
"The Lucky One"
Atlanta, Ga., Aug. 11
It was back to the era of Red at Swift's second show in Atlanta, where she played "The Lucky One" on the B-stage. The song, about the highs and lows of fame, hasn't been heard live recently, though it was a mainstay on the Red Tour.
Tampa, Fla., Aug. 14
Bringing "Invisible" to the stage in 2018 is about as unheard of as it gets from the canon of Taylor Swift. Not only is the song from the era of Swift's debut album, but it's a bonus track from the deluxe version of that album. She reportedly brought "Invisible" back to life on a Tuesday in August for a fan who told her the song helped him come out when he was a teenager.
Miami, Fla., Aug. 18
"I'm 99 percent sure I've never played this song live," Swift admitted before performing "Breathe," a deep cut from her Fearless album. The album recording of the country-pop ballad features vocals from Colbie Caillat, meaning this live solo surprise was a one-of-a-kind thing for fans to experience.
Nashville, Aug. 25
Swift says she wanted "Better Man" to "have its own moment," and it certainly did -- at the Grammys, the CMAs and at Nashville's Bridgestone Arena, where she treated the crowd to a rare solo performance of the beautiful song that was written by her, but recorded by country group Little Big Town.
"Jump Then Fall"
Detroit, Mich., Aug. 28
The pop star unveiled the rare gem from the re-release of Fearless in Detroit, marking the first time she performed "Jump Then Fall" in eight years. Her delivery of the love song is just as bubbly and bouncy as ever before.
Minneapolis, Minn., Aug. 31
In another return to her country roots, Swift strummed a pretty "Begin Again" at the first of two nights at U.S. Bank Stadium, the tour stop where she played the closing track from her Red album for the first time in 2018.
"Tied Together With a Smile"
Minneapolis, Minn., Sept. 1
For some reason Swift seemed surprised at the number of people in the crowd who knew the words to this "really, really old" song, found on her first album. "One thing I have noticed in my life is you can never judge what somebody else is going through,even if they seem like they have it all together," she said while introducing the track that probably hasn't been played live in more than 10 years.
"The Story of Us"
Kansas City, Mo., Sept. 8
"There's a song that I haven't played since the Speak Now Tour," Swift teased just before thrilling her longtime fans with an acoustic rendition of "The Story of Us," a song she wrote about an awkward run-in with an ex for 2010's Speak Now.
"Forever & Always"
Indianapolis, Ind., Sept. 15
In what amounted to a passion-filled sing-along, the country-turned-pop star offered the Fearless album track "Forever & Always," a song she recalled writing around the age of 18, as her acoustic surprise on the B-stage in Indianapolis.
St. Louis, Mo., Sept. 18
Swift rarely performs this Fearless album oldie from 2008, but decided to throw it back as she took to the B-stage of her Reputation Tour stop in Missouri.
New Orleans, Sept. 22
"I've never actually interrupted a wedding," Swift assured the crowd in New Orleans, teasing the next song on her set list, the title track of her 2010 album. Before bringing "Speak Now" to the B-stage that night, the pop star explained that many of her early songs were written about imaginary scenarios.
Houston, Texas, Sept. 29
"Wonderland" is a track that appeared only on the deluxe version of Swift's 1989 album, and it's one that Swift hasn't performed live all that often. Still, she shouldn't have been surprised that her fans would be singing right along with her, loud and clear.
Arlington, Texas, Oct. 5
Watch the clip below and you'll see it's safe to say most of the crowd at this show knew the words to the Fearless classic "White Horse," Swift's surprise acoustic song of the night. (Those at the show were lucky enough to get another treat on the main stage, too: Maren Morris joined the superstar for a duet of "The Middle.")
"I Knew You Were Trouble"
Perth, Australia, Oct. 19
Swift harkened back to past times in Perth with a special acoustic performance of "I Knew You Were Trouble," a song that was part of her Red Tour set list. The pop star played in the city back in 2013.
"I'm Only Me When I'm With You"
Melbourne, Australia, Oct. 26
"I wrote this song when I was 13 years old, and it was a bonus track on my first album," Swift said before launching into a performance of the track from her self-titled 2006 debut. The song is reportedly about her friend Abigail Anderson, and Swift later was a bridesmaid in her wedding.
Brisbane, Australia, Nov. 6
Swift brought out "Starlight" -- from her 2012 AOTY-nominated Red -- on her third date in Australia. She has previously noted that the song was largely inspired by Ethel and Bobby Kennedy's young romance.
"Out of the Woods"
Auckland, New Zealand, Nov. 9
Co-written by Jack Antonoff, "Out of the Woods" was the sixth official single from 1989 and later peaked at No. 18 on the Billboard Hot 100. Strumming away, Swift showcases her impressive vocal in the acoustic rendition of the track.
"I Know Places"
Tokyo, Japan, Nov. 20
Taking another cut from 1989, Swift most recently debuted "I Know Places" as the surprise b-stage track. The song addresses the difficulties of maintaining any sort of privacy in her relationships, especially with media outlets waiting at every corner.
This list will be updated as the Reputation Stadium Tour goes on.