Cole Swindell

As previously reported, Katy Perry's "Dark Horse," featuring Juicy J, spends a fourth week at No. 1 on the Billboard Hot 100, fending off Pharrell Williams' "Happy," which holds at No. 2. Who else makes notable moves on Billboard song charts this week?

-- John Legend: Eight years and a week after he first charted on Digital Songs (with "Ordinary People"), Legend lands his first top 10 on the tally. "All of Me" bounds 11-4 with a 46% gain to 164,000, passing 1 million downloads sold to date, according to Nielsen SoundScan. On the Hot 100, the piano ballad pushes 15-11.

-- Avicii: The DJ picks up his fifth No. 1 on Dance Club Songs with "Hey Brother" (3-1). With its uncredited bluegrass-tinged vocal from Union Station's Dan Tyminski, the track rises 30-27 on the Hot 100.

-- Cole Swindell: He tops Billboard's Hot Country Songs chart with his debut entry "Chillin' It," which lifts 3-1. The song (up 38-28 on the Hot 100) reaches the summit with gains in all of the chart's metrics. It shoots 5-2 on Country Digital Songs with 54,000 downloads sold (up 54%); bullets again at No. 3 on Country Airplay (43 million audience impressions, up 1%, according to Nielsen BDS); and, despite a 7-9 retreat on Country Streaming Songs, gains by 4% to 689,000 U.S. streams, according to BDS.

Swindell will likely snare the highest debut on next week's Billboard 200 album chart. His self-titled introductory set (which includes "Chillin' It") may move around 55,000 copies in its first week, according to industry prognosticators.

-- Martin Garrix: His nearly all-instrumental EDM track "Animals" enters the Hot 100's top 40 (45-37) in its 22nd week. Continuing its stateside segue, the former U.K. No. 1 rises 31-29 on Mainstream Top 40 and debuts at No. 37 on Rhythmic.

-- Ty Dolla $ign: In its 13th week on Hot R&B/Hip-Hop Songs, Ty Dolla $ign's "Paranoid," featuring B.o.B, steps 11-10 to become the former's first top 10 on the list. (It ascends 42-38 on the Hot 100.) The cut sports a 13% lift to 33,000 downloads, its best sales week yet; a 10% gain to 1.5 million U.S. streams; and, in the tracking week ending Feb. 18, a 9% rise to 30 million radio audience impressions. The lattermost haul helps it reach new peaks on the R&B/Hip-Hop Airplay (No. 8), Mainstream R&B/Hip-Hop (No. 6) and Rhythmic (No. 7) airplay charts.

-- Jason Aldean: He collects his 11th No. 1 on Country Airplay with "When She Says Baby" (No. 41 on the Hot 100), the fifth single and fourth leader from his album "Night Train." Aldean's set is the first to yield four No. 1 singles since Florida Georgia Line's "Here's to the Good Times" (2013) and the first by a solo male since Blake Shelton's "Red River Blue" (2011).

Aldean's fifth studio album previously generated the No. 1s "Take a Little Ride," "The Only Way I Know" (with Luke Bryan and Eric Church) and the title cut. (Third single"1994" peaked at No. 14 last May, marking just the second of Aldean's 20 charted singles to peak outside the top 10; "Relentless" reached No. 15 in 2008.)

-- Tegan and Sara: "Everything Is AWESOME!!!" (featuring the Lonely Island) is the Hot 100's Hot Shot Debut at No. 62. The signature song from "The Lego Movie," which has topped the North American box office in its first two weeks (grossing $130 million), roars onto Digital Songs at No. 18 (69,000, up 118%). In their sole prior Hot 100 appearance last year, Tegan and Sara reached No. 90 with "Closer."

-- Mariah Carey: The R&B diva posts her highest debut on Hot R&B/Hip-Hop Songs in nearly 16 years as "You're Mine (Eternal)" opens at No. 24 with Hot Shot Debut honors. Her previous best entrance was No. 4 with 1998's "My All," (a beneficiary of the chart's composition at the time, which facilitated impressive out-of-the-box debuts by superstar artists). "Mine" (a new entry on the Hot 100 at No. 88) sold 32,000 downloads in its first week of availability, enough for a No. 12 start on R&B/Hip-Hop Digital Songs. She scored her best debut on that chart with last year's "#Beautiful" (featuring Miguel), which began at No. 2 with 114,000 in its first week.

-- MKTO: The pop duo makes its Hot 100 introduction with "Classic" (No. 96). The song rebounds to its No. 34 peak on Mainstream Top 40. The ode to retro chic name-checks five acts that have topped the Hot 100: Michael Jackson, Prince, Marvin Gaye, Frank Sinatra and Beyonce.

-- Chevelle: Chicago hard rock band Chevelle returns to Hot Rock Songs, as "Take Out the Gunman" launches as the Hot Shot Debut at No. 35. The track storms onto Hard Rock Digital Songs at No. 2 with 10,000 first-week downloads sold. In its second week on the Mainstream Rock airplay chart, it blasts 25-13 with Greatest Gainer honors (up by 93% in plays). "Gunman" previews Chevelle's seventh album, "La Gargola," due April 1.

-- Tiesto: He unseats Ellie Goulding at No. 1 on Dance/Mix Show Airplay in short order with "Red Lights," which reaches the top in just its sixth week. The DJ's ascent is the quickest since Daft Punk hit No. 1 in five weeks with "Get Lucky" last June. "Lights" is the second No. 1 for Tiesto; "I Will Be Here" hit the top on Nov. 21, 2009. 

-- Romeo Santos: Two weeks after reaching No. 1 on Hot Latin Songs with new single "Odio," featuring Drake, Santos debuts follow-up single "Cancioncitas De Amor" at No. 9. The Bachata star holds four top 10 spots on the list, becoming the second artist to achieve the feat; Wisin & Yandel logged four simultaneous top 10s in 2006. Santos remains at No. 1 with "Odio" for a third week, continues at No. 3 with "Propuesta Indecente" and stays at No. 7 as the featured act on Enrique Iglesias' "Loco." "Cancioncitas" sold 17,000 downloads in its first week.

-- Phil Wickham: On Christian Airplay, he notches his first No. 1 with "This Is Amazing Grace" (2-1). Since first appearing on the ranking in 2006, he'd previously peaked as high as No. 4 with 2010's "Safe."

-- Wilmer Valderrama: A name familiar to TV viewers makes his Billboard chart debut, as he enters Tropical Airplay at No. 37 with "Salud," with Sky Blu (of LMFAO), Reek Rude and Sensato. While Valderrama may best be known for his breakout role as Fez on Fox's "That '70s Show" (1998-2006), music has long been a passion of his. Among his prior musical ventures, another notable pairing with Sky Blu: he makes a cameo in the video for LMFAO's 2012 two-week Hot 100 No. 1 "Sexy and I Know It." Valderrama also directed the "Salud" video, which boasts 1.6 million YouTube views. 

-- Carrie Underwood: Noteworthy on Country Digital Songs is a No. 22 debut for Underwood's "Look at Me," which makes a union with the chart thanks to surging interest in a viral video of vocally-gifted bride Arianna Pflederer singing the song to her then-husband-to-be, Ryan. Underwood's original version of the love ballad, from her 2009 album "Play On," debuts on Country Digital Songs at No. 22 (18,000, up from 3,000 the week before).

("That, my friend, is called making an entrance," the wedding's officiator notes to the emotional groom afterward. "And, it was all for you.")

Additional reporting by Wade Jessen, Amaya Mendizabal, Gordon Murray and Rauly Ramirez