Music Photos of the Year 2012
September 21: Rihanna performs onstage during the 2012 iHeartRadio Music Festival in Las Vegas.

Taylor Swift has notched her first Hot 100 No. 1 and P!nk has pocketed her first Billboard 200 leader. What other stars could be in line for their first toppers?

GLEE 14.0: The "Glee" cast scores its 14th No. 1 on the Soundtracks chart, as its digital-exclusive Britney Spears covers set "Glee: Season Four: Britney 2.0" EP bows at the apex. The ensemble has missed No. 1 only with last year's "Glee: the 3D Concert Movie," which spent two weeks at No. 2.

No songs from the Spears tribute album enter the Hot 100, which Billboard associate chart production manager Alex Vitoulis attributes partly to some Gleeks having opted to purchase the EP in full instead of songs a la carte (the latter option translating to track sales that would count toward the Hot 100).

Not to throw the verbal equivalent of a Slushee, but Vitoulis also muses that Fox having moved "Glee" from Tuesday to Thursday nights this season could negatively impact the cast's chart chances. While each new episode's songs still hit retail at the beginning of the week, because "Glee" now doesn't air until Thursdays, two fewer days of post-"Glee" buzz could translate to fewer download sales by the end of each Nielsen SoundScan sales tracking week.

HOUSE MUSIC: After notching five consecutive top three hits on Dance Club/Play Songs since its 2010 arrival, EDM trio Swedish House Mafia makes its first Hot 100 visit, as "Don't You Worry Child," featuring John Martin, debuts at No. 68. The song arrives following the Sept. 14 premiere of its video.

"Child" concurrently continues scaling Billboard's dance charts, rocketing 12-3 on Dance/Mix Show Airplay and 19-13 on Dance Club/Play Songs.

THEY'VE CHARTED 'A LOT': Aerosmith logs its 14th top 10 on the Heritage Rock radio airplay chart (which launched in 1997), as "Lover Alot" lifts 13-9. With the climb, the band ties 3 Doors Down for the third-most top 10s in the tally's history, after Nickelback, the leader with 18, and Shinedown (15).

On Adult Pop Songs, Aerosmith pushes 30-27 with ballad "What Could Have Been Love." Both singles preview the group's 15th studio album, "Music From Another Dimension!," due Nov. 6.

PIT RISE: Boston band (like Aerosmith) Passion Pit tastes the top 10 on Alternative Songs, as "Take a Walk" strolls 11-10 in its 20th week.

The song has received extra exposure from its inclusion in Taco Bell's current Doritos Tacos Locos advertising campaign. Brian Niccol, chief marketing and innovation officer at Taco Bell, says that connecting with rising acts fits well with the chain's goal to attract young consumers. "I'm not going to put the wrong vibe in our ad. If I'm putting in music that's forward-looking, it helps us be one step ahead."

Plus, regarding Passion Pit specifically, "We're big fans," Niccol says. "With their record out [parent set 'Gossamer' entered the Billboard 200 at No. 4 last month], we wanted to make our fans even more aware of their music."

(The song's ascent to the Alternative Songs top 10 could be considered the greatest taco-related chart achievement since Taco's "Puttin' on the Ritz" reached No. 4 on the Hot 100 this month in 1983.)

SHE'S THE MANN: Aimee Mann's voice still carries.

In 1985, the singer/songwriter arrived as the lead singer of pop/rock band 'til Tuesday (yet another Boston act, like Passion Pit and Aerosmith), which reached No. 8 on the Billboard Hot 100 with "Voices Carry." The song doubled as the title to the group's debut album, which rose to No. 19 on the Billboard 200, marking the quartet's sole appearance in the chart's top 40.

Following the band's early '90s breakup, Mann has now tripled her sum of top 40-charting albums as a soloist. 2002's "Lost in Space" debuted and peaked at No. 32, while 2008's "@#%&*! Smilers" entered and peaked at No. 32. This week, "Charmer" charges in at No. 33.

Not that Mann is entirely on her own. As previously praised, the video for new single "Labrador" (which includes a good-natured poke at the "Voices Carry" clip, as well as Mann's big-'80s hair) features actor and "Mad Men" star Jon Hamm.

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