Bruno Mars 'Locked' at No. 1 on Hot 100, Taylor Swift Closing In

Bruno Mars Gets 'Locked Out of Heaven' in New Video: Watch

Bruno Mars Gets 'Locked Out of Heaven' in New Video: Watch

Mars' 'Locked Out of Heaven' remains atop the chart, while Swift's 'I Knew You Were Trouble' surges toward the summit. Plus, PSY returns to the top 10

Bruno Mars holds atop the Billboard Hot 100, as "Locked Out of Heaven" spends a fourth week at No. 1. Taylor Swift's "I Knew You Were Trouble.," meanwhile, continues its play for the top, pushing 4-2, and PSY's "Gangnam Style" re-enters the top 10.

THE HOT 100: Covered
No. 1: Bruno Mars
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No. 2: Taylor Swift
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No. 3: Rihanna
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No. 4: The Lumineers
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Justin Bieber
No. 5: Justin Bieber
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No. 6: PSY
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No. 7: Ke$ha
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As it maintains its command over the Hot 100, "Heaven" spends a second week at No. 1 on Radio Songs, logging a less than 1% increase to 140 million all-format audience impressions, according to Nielsen BDS. "Heaven" relinquishes its three-week rule on Digital Songs, falling 1-2 despite a 120% gain to 497,000 downloads sold, according to Nielsen SoundScan. As previously reported [LINK to Billboard 200 story], sales during the Dec. 24-30 tracking week soared as consumers cashed in on digital retailers' gift cards, a tradition of the decade-old digital era; all titles but three in the Digital Songs top 50 this week gain by at least 100%.

"Heaven" likewise slips 1-2 on On-Demand Songs after two weeks on top, decreasing by 5% to 1.03 million on-demand streams, according to BDS.

Swift's "Trouble" leaps 4-2 with the Hot 100's top Digital Gainer award for a third week. The song reaches a new peak, having bounded onto the Hot 100 at No. 3 nine weeks ago as a then-preview cut to her album "Red," arriving that week (Oct. 27) at No. 1 on Digital Songs (416,000). The second pop radio single from the set returns to the Digital Songs apex with a 164% gain to 582,000 downloads sold, marking the fourth-best weekly sales sum of the digital era, two of which belong to Swift: "Trouble" trails only Flo Rida's "Right Round" (636,000, Feb. 28, 2009), Swift's "We Are Never Ever Getting Back Together" (623,000, Sept. 1, 2012) and Ke$ha's "TiK ToK" (610,000, Jan. 9, 2010). With its latest frame, "Trouble" passes 2 million downloads sold to date.

BILLBOARD 200: Taylor Swift's 'Red,'
'Les Mis' Soundtrack Lead

"Trouble" retreats 11-12 on Radio Songs, although with a 5% uptick to 67 million. (It's not available to subscription streaming services and, thus, does not appear on On-Demand Songs.)

Despite Swift's swell in sales momentum, "Heaven" boasts a lead of more than 10,000 overall Hot 100 chart points over "Trouble." The latter title, however, gains by more than twice as much (up 113%) as the former (up 49%), pushing Swift closer to her potential second No. 1, following "Together" (which reaches 3 million in total digital sales).

Rihanna's former three-week Hot 100 No. 1 "Diamonds," atop R&B/Hip-Hop Songs for a 13th week, descends 2-3. It returns (2-1) for a sixth week atop On-Demand Songs with 1.07 million on-demand streams (up 2%) and 1.29 million streams overall; holds at No. 2 on Radio Songs (132 million, down 2%), which it led for three weeks; and is a non-mover at No. 5 on Digital Songs, although up 159% to 365,000) after ruling the ranking the week of Dec. 1. It, too, crosses the 2-million sold-to-date barrier.

The Lumineers' "Ho Hey" regresses 3-4 on the Hot 100, while leading the Rock Songs chart for a fifth consecutive week, and Justin Bieber's "Beauty and a Beat," featuring Nicki Minaj, holds at No. 5 on the Hot 100. With 372,000 downloads sold last week (up 212%), "Beauty" passes 1 million in sales to date (1.29 million).

Powered by consumers purchasing some of 2012's most buzzworthy hits and radio airplay recounting the same in year-end retrospectives, PSY's "Gangnam Style" gallops back into the Hot 100's top 10 (19-6). The song peaked at No. 2 for seven weeks in October and November and had last ranked in the top 10 the week of Dec. 15. "Style" soars 8-3 on Digital Songs with a 245% gain to 400,000 downloads sold, marking its best weekly total. (It's sold 3.6 million since its release.)

Rounding out the Hot 100's top 10, Ke$ha's No. 2-peaking "Die Young" drops 6-7 (and is the top bracket's third title to pass 2 million downloads sold), followed by Maroon 5's "One More Night" (7-8); Phillip Phillips' "Home" (9-9); and Macklemore and Ryan Lewis' "Thrift Shop" (10-10), which sold 304,000 downloads last week (up 116%), pushing it past 1 million in to-date sales.

Among highlights below the Hot 100's top 10, rapper A$AP Rocky's "F**kin Problems," featuring Drake, 2 Chainz and Kendrick Lamar, claims top Streaming Gainer honors, despite descending 24-26. The track vaults 24-13 on On-Demand Songs (553,000, up 11%).

In addition to PSY benefiting from nostalgia-fueled year-end airplay and sales surges, the top two songs of 2012 rebound on the Hot 100. Gotye's "Somebody That I Used to Know," featuring Kimbra, last year's top Hot 100 title, rises 49-48 (in its 52nd week) with top Airplay Gainer kudos, roaring 45-24 on Radio Songs (up 63% to 41 million). (Adult contemporary radio returning to regular programming after Christmas Day also aids the song's advance, as "Somebody" re-enters the Adult Contemporary chart at No. 1, marking its 17th nonconsecutive frame on top.) 2012's runner-up song, Carly Rae Jepsen's "Call Me Maybe," charges 43-27 on the Hot 100, up 65-36 on Radio Songs (33 million, up 61%).

Check later today (Jan. 3), when all rankings, including the Hot 100 and On-Demand Songs in their entirety and Digital Songs and Radio Songs, will be refreshed, as they are each Thursday; due to the New Year's holiday, all charts are updating later than usual today (around 6 p.m.)