"We Found Love" by Rihanna featuring Calvin Harris logs its 10th week at #1 on the Hot 100. That's the longest run at #1 by any single since the Black Eyed Peas' "I Gotta Feeling" amassed 14 weeks in the lead in 2009. It's the longest run for a collaboration since "Low" by Flo Rida featuring T-Pain had 10 weeks on top in 2008. It's the longest run for a male-female collabo since "Dilemma" by Nelly featuring Kelly Rowland had 10 weeks on top in 2002.

"We Found Love" is the 28th song to log 10 or more weeks at #1 since 1955. The record for most weeks at #1 is held by "One Sweet Day" by Mariah Carey & Boyz II Men, which was on top for 16 weeks in 1995-1996.

Adele's 21 logs its 15th week at #1 on The Billboard 200, which equals the mark set in 1971 by Carole King's Tapestry. Since 1956, when the album chart became a weekly feature, only one other album by a female artist has logged 15 or more weeks at #1: Whitney Houston's 1992 soundtrack to The Bodyguard (which had 20 weeks on top).

Next month, Adele is expected to tie King again. Adele is almost certain to win Grammys for Album, Record and Song of the Year. That would make her only the second female solo artist to win in all three categories. King swept the boards in March 1972 with Tapestry (Album), "It's Too Late" (Record) and "You've Got A Friend" (Song).

Grammy officials are fervently hoping that Adele doesn't equal King in another respect. King was a new mother in March 1972 and opted not to fly from California to New York for the Grammys. Adele is recovering from throat surgery, but is expected to be able to perform at the show.

Adele's 21 returns to #1 on The Billboard 200 for first time since October. This is the album's 14th week on top, which is the longest run at #1 for any album since the Titanic soundtrack spent 16 weeks at #1 in 1998. It's the longest run for an album by a female artist since Whitney Houston's The Bodyguard soundtrack logged 20 weeks on top in 1992-1993. It's the longest run for an album by a British artist since the Police's Synchronicity was #1 for 17 weeks in 1983.

21 is in its 45th week on the chart. It's the first album to appear at #1 this deep into its chart run since Norah Jones' Come Away With Me was #1 in its 53rd week in March 2003. That album returned to #1 after it won the Grammy for Album of the Year. 21 is certain to win that award when this year's Grammys are presented on Feb. 12.

This past year was the worst for movie and TV soundtrack albums since Nielsen SoundScan began tracking sales for Billboard in 1991. Not one soundtrack sold even 400,000 copies during the year, which is less than half of the previous low. The best-selling soundtrack of 2011 was from Lemonade Mouth (a Disney Channel movie), which sold 379,000 copies during the year. The best-selling soundtrack from a theatrically-released movie was The Twilight Series: Breaking Dawn—Part One, which sold 368K copies.

This is the fourth time in the past six years that the year's top soundtrack was from a TV show rather than a theatrically-released movie. This is the second year in a row that a Twilight soundtrack has been the year's top-selling soundtrack to a theatrically-released movie. The Twilight Saga: Eclipse took that title in 2010.