Nick Jonas

Nick Jonas visits Billboard's New York offices on July 22, 2014.

Trish Halpin

As previously reported, Meghan Trainor leads an all-female top 5 on the Billboard Hot 100 for a second week with "All About That Bass." Plus, Fall Out Boy's "Centuries," and Calvin Harris' "Blame" featuring John Newman, debut at Nos. 22 and 31, respectively. Who else makes moves this week?

Katy Perry: Her former four-week No. 1 "Dark Horse," featuring Juicy J, spends its 52nd week on the chart, becoming her first Hot 100 hit to reach the milestone one-year mark. Runners-up "Hot N Cold" (2008-09) and "Firework" (2010-11) charted for 39 weeks each. "Horse" ambles 32-38, below current Perry single "This Is How We Do," which backtracks 24-27, although with a bullet (up by 4 percent in chart points).

Milky Chance: "Stolen Dance," the German duo's debut hit, surges 68-61 on the Hot 100. Helping fuel its rise, it debuts on Digital Songs at No. 45 with 29,000 downloads sold (up 12 percent), according to Nielsen SoundScan. "Dance" also crowns Alternative Songs (2-1), while topping Adult Alternative Songs for a sixth week. First released in April 2013, the track previously reached No. 1 on the Germany, Austria, Luxembourg, Switzerland, France and Ireland Digital Songs charts.

Nick Jonas: After whimsically describing the song as "kind of new-agey Lionel Richie" to Billboard at the MTV Video Music Awards on Aug. 24, Jonas enters the Hot 100 at No. 78 with "Jealous." The midtempo, R&B-leaning track starts with 26,000 first-week downloads sold.

It also bows at No. 37 on Pop Songs, marking his first solo entry on the Nielsen BDS-based airplay chart; as one-third of the now-defunct Jonas Brothers, he placed six songs on the survey in 2007-13. "Jealous" previews Jonas' forthcoming second album. His first, Who I Am, with backing band the Administration, debuted and peaked at No. 3 on the Billboard 200 in 2010.

Train: "Angel in Blue Jeans" enters the Hot 100 at No. 91 and introduces the band's seventh studio album, Bulletproof Picasso. The set should challenge for a top 10 debut on next week's Billboard 200, highlights of which will post on Billboard.com next Wednesday (Sept. 24).

Sam Smith: "I'm Not the Only One," the follow-up to the No. 2-peaking "Stay With Me" (which holds at No. 6), re-enters the Hot 100 at No. 93. It first charted for a week at No. 69 in June, two weeks before parent album In the Lonely Hour bowed on the Billboard 200 at No. 2.

"His new one may be his best yet," says Mike Mullaney, assistant program director/music director at adult pop WBMX Boston, which gave "One" six first-time plays last week. "Seriously, his voice is genius."

Additional reporting by Emily White.