As we do each Wednesday (the day that the sales/airplay/streaming-based Hot 100 is compiled each week), let's run down the numbers behind the chart's top 10.
Trainor's single, which mixes its message with dashes of doo-wop and early '60s girl-group harmonies, reaches the Hot 100's apex as the top Digital, Streaming and Airplay Gainer. It rebounds 2-1 for a third week atop Digital Songs with 312,000 sold, up 17 percent, according to Nielsen SoundScan.
Helping stir publicity for the song: Trainor performed it on NBC's The Tonight Show Starring Jimmy Fallon on Sept. 4 as the latest entry in his running bit that makes over hits with classroom instruments. "Bass" holds at No. 2 on Streaming Songs (which it led for a week), up by 7 percent to 13.1 million U.S. streams, according to Nielsen BDS.
It returns to the top of the subscription services-based On-Demand Songs chart (2-1, marking its second week in charge), although with a 6 percent dip to 3.3 million. The song pushes 9-6 on Radio Songs with a 26 percent leap to 103 million in all-format audience. It's the first debut Hot 100 entry by a woman (in a lead role) to link four straight weeks as the top Airplay Gainer since Ashanti strung together six weeks with "Foolish" in 2002.
Trainor's Hot 100 takeover is only part of a big week for the 20-year-old: she released her debut four-song EP, Title, on Tuesday. The set is due on next week's Billboard 200.
Meghan Trainor On 'Bass': It's About 'Loving Your Body … And Your Booty'
Other highlights of Trainor's Hot 100 coronation: "Bass" is the second debut No. 1 by a lead female artist this year, following Iggy Azalea's seven-week reign with "Fancy," featuring Charli XCX. The last year in which two maiden entries by women in lead roles ruled the Hot 100? 2008, when Leona Lewis ("Bleeding Love") and Katy Perry ("I Kissed a Girl") each dominated on their first tries.
"Bass" also brings acclaim to Trainor's label, Epic. It's Epic's first Hot 100 leader since Sean Kingston's fellow debut hit "Beautiful Girls" in 2007 (which Koch co-promoted with Epic). "Bass" is Epic's first No. 1 by a woman since Shakira's own ode to seductive shaking, "Hips Don't Lie," in 2006. The last lead female artist on Epic to take a debut hit to the top of the Hot 100? Minnie Riperton, whose soul classic "Lovin' You" led the April 5, 1975 list. (The late Riperton's daughter is actress Maya Rudolph.)
Trainor additionally makes her home state proud, joining other Massachusetts-born acts that have led the Hot 100, including Donna Summer, Bobby Brown, Aerosmith, Extreme and New Kids on the Block. (The latter group reigned 25 years ago this week with "Hangin' Tough.")
While those acts are all from the Boston area, Trainor is from the island of Nantucket, off the coast of Cape Cod. She's now based in Nashville. (Trainor also swats the Hot 100's first No. 1 "Bass" hit. The second-highest-peaking song with "bass" in its title: Nicki Minaj's "Super Bass," which reached No. 3 in 2011.)
Taylor Swift Makes Album Promotion an Art in Her Debut 'Shake It Off' Week
As "Bass" tops the Hot 100, Swift's "Shake" slips 1-2 after two weeks at the summit. The song drops 1-2 on Digital Songs (281,000, down 21 percent). Still, it passes a million in sales, having moved 1.18 million in its first three weeks. "Shake" falls 4-6 on Streaming Songs (7 million, down 20 percent) and holds at No. 7 on Radio Songs with a 16 percent surge to 102 million.
With "Bass" up by 14 percent in overall points and "Shake" down by 14 percent, the former could be set up for a comfortable stay atop the Hot 100.
Minaj's "Anaconda" keeps at No. 3 for a second week after reaching No. 2 two weeks ago (marking her highest Hot 100 rank). The cut spends a third week atop Streaming Songs but decreases by 24 percent to 13.1 million (just slightly higher than the sum for "Bass"). "Anaconda" retreats 4-5 on Digital Songs (130,000, down 31 percent) and slithers 40-36 on Radio Songs (35 million, up 11 percent). It logs a third week at No. 1 on both Hot R&B/Hip-Hop Songs and Rap Songs.
Sam Smith's No. 2-peaking "Stay With Me" backtracks 5-6 on the Hot 100 and tallies a fifth week at No. 1 on Radio Songs (144 million, down 4 percent). (His new single, just announced, is "I'm Not the Only One.")
MAGIC!'s former six-week No. 1 "Rude" reverses course 8-7, while Grande's "Break Free," featuring Zedd, descends 7-8 (after rising to No. 4) and leads Hot Dance/Electronic Songs for a fourth week.
Maroon 5 Tops Billboard 200 With 'V'
Maroon 5's No. 6-peaking "Maps" returns to the Hot 100's top 10 (11-9), as parent album V debuts atop the Billboard 200. As announced this morning, Grande and Maroon 5 will be the first two musical guests on the new season of NBC's Saturday Night Live on Sept. 27 and Oct. 4, respectively (alongside respective hosts Chris Pratt and Sarah Silverman).
Closing out the top 10, Sia's "Chandelier," which has reached a No. 8 high, drops to No. 10.
Visit Billboard.com tomorrow (Sept. 11), when all rankings, including the Hot 100 in its entirety and Digital Songs, Radio Songs and Streaming Songs, will refresh, as they do each Thursday. The latest charts will also appear in the next issue of Billboard magazine (on sale on Friday, Sept. 12).