Week of September 26

Katy Perry bounces back for a third nonconsecutive week at No. 1 with "Teenage Dream." Her song is the fourth charttopper in 2010 to come back for another go-around; the previous three were V.V. Brown's "Shark in the Water," The Bird and the Bee's "Heard It on the Radio" and the Zac Brown Band's "Free." Zac and his band, meanwhile, move 3-2, trying to unseat Katy with "As She's Walking Away," a collaboration with Alan Jackson.

Other chart news this week from superstar collaborations: The biggest mover is "While My Guitar Gently Weeps" from Santana, India.Arie and Yo-Yo Ma, 40-29. Meanwhile, both Enrique Iglesias and Pitbull score concurrent Top 10 hits. Both artists are featured on "I Like It" at No. 5, while Pitbull teams up with Usher on No. 6, "DJ Got Us Fallin' in Love," and Iglesias pairs with Akon on No. 10, "One Day at a Time."

As a collaborator and as a solo artist, Cee-Lo Green has a strong week. With Fantasia, he moves 31-26 with "The Thrill Is Gone." Solo, he sprints 27-21 with "Forget You."

Of this week's four new entries, the highest is by a newcomer, Brendan James, a New Hampshire native and UNC-Chapel Hill graduate. "The Lucky Ones" enters at No. 37. On the other end is an artist who began national popularity in the late 1950s with his brothers on what has become a wedding-reception classic, "Shout!" Ronald Isley debuts at No. 39 with "No More." It's his first solo hit; outside the Isley Brothers, he went to No. 1 in collaborations with Rod Stewart ("This Old Heart of Mine," 1990) and R. Kelly ("Down Low (Nobody Has to Know), 1996).