The Billboard Hot 100:
-- Britney Spears: Although she snaps a string of two consecutive No. 1 debuts ("3" and "Hold It Against Me"), an honor only she and Carey have earned, Spears logs the fifth-highest debut of her 25 Hot 100 entries, as "Till the World Ends" begins at No. 20. The second single from "Femme Fatale," due March 29, arrives with 117,000 downloads sold, according to Nielsen SoundScan, after three days of availability. "Hold," the record's lead track, launched at No. 1 seven weeks ago with 411,000 downloads (after six days on sale). "World," co-written by Ke$ha, concurrently starts at No. 68 on Hot 100 Airplay with 16.8 million out-of-the-box audience impressions on 145 stations, according to Nielsen BDS.
-- Lady Gaga: "Born This Way" banks a fourth week -- its entire chart life - atop the Billboard Hot 100. The song is the first to begin at No. 1 and remain on top for as many as four frames since Aerosmith's "I Don't Want to Miss a Thing" (also four) in 1998. Four other songs have launched with as much lasting fanfare: Mariah Carey's "Fantasy" (eight weeks, 1995), Carey and Boyz II Men's "One Sweet Day" (16 weeks, 1995-96), Puff Daddy (as he was then credited) and Faith Evans' "I'll Be Missing You," featuring 112 (11 weeks, 1997), and Elton John's "Candle in the Wind"/"Something About the Way You Look Tonight" (14, 1997-98). "Born" is the only such song to achieve the feat in the digital era.
-- Jennifer Lopez: Following the premiere of the "On the Floor" video on the March 3 "American Idol" episode (when Lopez and fellow judges Randy Jackson and Steven Tyler just so happened to need a few extra minutes' deliberation, allowing host Ryan Seacrest to cut to the clip), the song jumps 9-5. Sales swell by 31% to 223,000 downloads sold.
-- Ke$ha: As "Blow" (11-7) blasts 10-6 on Hot Digital Songs (164,000, up 27%), Ke$ha has sent all six of her radio singles as a lead artist into the Hot 100's top 10. She also reached No. 9 last May as a guest on 3OH!3's "My First Kiss." Her current hit also jumps 34-28 (38.2 million, up 8%) on Hot 100 Airplay, fueled by a 14-13 lift on Mainstream Top 40.
-- Jeremih: The rapper registers his second top 10 on Hot 100 Airplay, where "Down on Me" charges 16-10 (64 million, up 10%). The track darts 20-12 on the Hot 100. His introductory smash "Birthday Sex" peaked at No. 3 on Hot 100 Airplay (and No. 4 on the Hot 100) in 2009.
-- The Black Eyed Peas: As "Just Can't Get Enough" bounds 66-38, the quartet collects its 14th consecutive top 40 Hot 100 hit, marking the longest streak by a group since the Eagles also linked 14 in 1975-99. Wings hold the record among groups: all 23 of their chart entries reached the top 40 in 1972-80. (Elton John leads all artists with 36 consecutive top 40 hits in 1972-86).
-- Willow: After she co-hosted "The Oprah Winfrey Show" March 1, the 10-year-old re-enters her debut hit, "Whip My Hair," at No. 86 (25,000 downloads, up 41%) and charts her follow-up, "21st Century Girl," at No. 99 (23,000 first-week downloads).
The Billboard 200:
-- Adele & Marsha Ambrosius: Though Adele's "21" continues to reign atop the Billboard 200 for a second week (168,000; down 52%), former Floetry member Marsha Ambrosius makes a somewhat surprising bow in the runner-up slot . Her solo debut, "Late Nights & Early Mornings," enters at No. 2 with 96,000 and also starts at No. 1 on Top R&B/Hip-Hop Albums.
Further down the list -- outside the top 10 -- there are a number of interesting climbs worth noting:
-- "Burlesque": After the film was released on DVD last week, its companion soundtrack takes an appropriate showy increase (up 398%). It vaults 140-18 -- up 122 slots, the largest positional jump this week. With 22,000 sold last week, it hasn't sold this much in a week since the Christmas frame.
-- "The Social Network": After a full week's worth of impact from the Academy Awards, the winner of best original score zips with a 73% increase (125-59, the second-largest rise on the list). This week, with 9,000 sold, the soundtrack crosses the 100,000 sales mark (rising to 106,000 total).
-- Queen: Sale pricing at iTunes lifts the hits compilation to an overall increase of 263% and a re-entry at No. 108. Its digital gain is extraordinary -- up by more than 1,000%, moving from basically no downloads to 4,000.
-- Crystal Bowersox: With the new season of "American Idol" in full swing, how are last season's runner-up and winner doing? Bowersox, the second-placer, has sold 166,000 of her "Farmer's Daughter" album (No. 117 this week) while champ Lee DeWyze's "Live It Up" set has moved 123,000 (last seen on the tally on Feb. 5).