Adele's '21' Set for 21st Week at No. 1

The performance many have been waiting for: Adele performs the Song and Record of the Year winner, "Rolling in the Deep."

Tracking to Sell Between 500-600,000 Copies... '19' Should Crack Top 5

A dele's "21" album is going to celebrate its first year on the Billboard 200 chart in grand style. Fresh off her six Grammy Award wins on Sunday (Feb. 12) night, "21" is on course to sell between 500,000 to 600,000 copies by week's end on Sunday, Feb. 19.

Adele's '21' Hits 20th Week at No. 1, Van Halen at No. 2

Next week will mark the set's 52nd week on the list and it should easily rack up a 21st frame at No. 1. It could earn the biggest sales week for any album since Drake's "Take Care" debuted with 631,000 on the chart dated Dec. 3, 2011 according to Nielsen SoundScan. Even better - it will be "21's" biggest sales week, period. It's highest week came over the Christmas holiday, when it shifted 399,000.

Adele's first album, "19," is also selling well, and should move into the top five on the Billboard 200 next week. The last act to have two albums in the top five at the same time was Justin Bieber on March 12, 2011 ("Never Say Never: the Remixes" was No. 2 and "My World 2.0" was No. 5).

The new Billboard 200 chart's top 10 will be revealed on the morning of Wednesday, Feb. 22.

With a 21st week at No. 1, "21" will become the longest-running No. 1 album by a woman in history. (It's currently tied with Whitney Houston's "The Bodyguard" soundtrack, with 20 weeks.) Further, "21" could become the biggest No. 1 album by any act since M.C. Hammer's "Please Hammer Don't Hurt 'Em" spent 21 weeks at No. 1 in 1990.

Here are the albums with the most weeks at No. 1 in the nearly-56 year history of the Billboard 200 chart: (Weeks at No. 1, Title, Artist, Peak Year)

54 -- "West Side Story soundtrack, 1962**
37 -- "Thriller," Michael Jackson, 1983
31 -- "Rumours," Fleetwood Mac, 1977
31 -- "South Pacific" soundtrack, 1958
31 -- "Calypso," Harry Belafonte, 1956
24-- "Purple Rain," Prince and the Revolution/Soundtrack, 1984
24 -- "Saturday Night Fever" soundtrack, 1978
21 -- "Please Hammer Don't Hurt 'Em," M.C. Hammer, 1990
20 -- "21," Adele, 2011
20 -- "The Bodyguard," Whitney Houston/Soundtrack, 1992
20 -- "Blue Hawaii," Elvis Presley/Soundtrack, 1961

** (The figure of 54 weeks at No. 1 combines the set's time atop separate stereo and mono LP charts before the Billboard 200 became a singular ranking the week of Aug. 17, 1963.)