Week of August 15

With a tight Top 10 this week (songs moving up one or two positions), the song just below it is making the most chart noise. Katy Perry's "Teenage Dream" zooms 29-11, undoubtedly heading to become her fourth Top 10 hit in the past two years, following "Hot 'N Cold," "Waking Up in Vegas" and "California Gurls" (with Snoop Dogg). Perry's first chart hit, "I Kissed a Girl," peaked at No. 20; her collaboration with Timbaland, "If We Ever Meet Again," hit No. 15 last month.

Four debuts this week, including follow-ups to recent No. 1 hits for the Zac Brown Band and David Gray. The Zac Brown Band team up with country chart-topper Alan Jackson on "As She's Walking Away" at No. 33; the song marks Jackson's seventh Top 40 appearance. His biggest hit is 2002's "Where Were You (When the World Stopped Turning)?" which stayed at No. 1 for three weeks. Meanwhile, Gray's "A Moment Changes Everything" at No. 38 is his ninth Top 40 hit; his list of No. 1 songs includes "Babylon," "Say Hello, Wave Goodbye" and his recent duet with Annie Lennox, "Full Steam."

Another debut comes from Seal. "Secret," at No. 35, is Seal's first appearance since his remake of "A Change is Gonna Come" hit No. 28 in 2008. Seal has hit the top twice, with his debut hit "Seal" in 1991 and "A Prayer for the Dying" in 1994.