Week of February 27

After a few weeks of hot chart action, this week's chart cools down a bit, with only one debut, giving a chance to take a look at some potentially overlooked stories on the chart.

Slow climber: The only new song in the Top 10 this week is Sunshine Anderson's "A Warning for the Heart," moving 11-10 in its 16th week on the survey. That's the slowest climb into the Top 10 since the weekly charts resumed in 2006. Tim McGraw's "Southern Voice" and Moby's "Disco Lies" each hit the Top 10 in 14 weeks. Anderson earns her third Top 10 hit with this song; her debut hit, "Heard It All Before," went to No. 1 in 2001, and later that year, she followed up with a guest appearance on Macy Gray's "Don't Come Around" (No. 5, two weeks).

Biggest "Fool": Cee-Lo Green has his biggest chart hit yet with "Fool for You," which hangs in at the top for a fourth straight week. His previous best came in 2000, when his collaboration with Lauryn Hill and Santana, "Do You Like the Way?" went to No. 1 for three weeks. Here's a look at the 10 biggest "Fools" in this chart's history:

1) "Fool for You," Cee-Lo Green (No. 1, four weeks to date, 2011).
2) "Fool If You Think It's Over," Chris Rea (No. 1, three weeks, 1978).
3) "Maybe I'm a Fool," Eddie Money (No. 1, one week, 1979).
4) "Who'll Be the Fool Tonight?" Larsen-Feiten Band (No. 2, 1980).
5) "What a Fool Believes," Doobie Brothers (No. 3, 1979).
6) "Everybody Plays the Fool," Aaron Neville (No. 5, three weeks, 1991).
7) "Only the Fools Survive," Donna Summer/Mickey Thomas (No. 5, one week, 1988).
8) "What Kind of Fool?" Barbra Streisand/Barry Gibb (No. 8, three weeks, 1981).
9) "What Kind of Fool Am I?" Rick Springfield (No. 10, two weeks, 1982).
10) "Fool for You Anyway," Foreigner (No. 11, two weeks, 2010).

Quite a collaborative week: Superstar collaborations make up more than a quarter of this week's Top 40, from Dave Koz and Herb Alpert at No. 3 to Elton John and Leon Russell at No. 40. Particularly adept are Ricky Martin and the late Michael Jackson. Each has two collaborations in the survey -- Martin teams with Wisín & Yandel for "Frio" (No. 36) and Joss Stone on "The Best Thing About Me Is You" (No. 37), while Jackson partners with Akon on "Hold My Hand" (No. 34) and Lenny Kravitz on "(I Can't Make It) Another Day" (No. 14).

Caliente, in any language: With separate Spanish-language and English-language hits on the chart, Ricky Martin becomes the first artist to have concurrent Top 40 hits in different languages. The last artist to earn a Top 40 hit in Spanish was Nelly Furtado; she went to No. 11 in 2009 with "Más." Though she had an English hit earlier in the year with James Morrison on "Broken Strings," and later in the year with Timbaland and SoShy on "Morning After Dark," neither of those songs crossed over the chart run of "Más."

Perry's streak: This week, Katy Perry tops her previous best of consecutive Top 20 hits. In 2008-09, she scored three Top 20 songs from "One of the Boys." This week, "Teenage Dream" spins off its fourth consecutive Top 20 hit as "Not Like the Movies" moves 30-18. That joins "California Gurls," "Teenage Dream" and "Firework" as Top 20 hits for Perry.