Week of April 17

Big stories at the top and bottom of this week's chart, but also a lot of action in the middle:

* At No. 1, Katy Perry earns her fourth charttopper in the past three years, as "Not Like the Movies" moves up one final place. She's gone to the top with "Hot 'N' Cold," "California Gurls" featuring Snoop Dogg and "Teenage Dream." In that three-year period, the only other artist to hit the top that often is Darius Rucker ("Don't Think I Don't Think About It," "History in the Making," "It Won't Be Like This for Long" and "Southern State of Mind," the song that hit the top two weeks back). Right behind them are Uncle Kracker ("Smile," "Another Love Song" and "Good to Be Me," the last with Kid Rock) and Cee-Lo Green ("Forget You," "The Thrill Is Gone" with Fantasia and "Fool for You"). Green is pushing to join Perry and Rucker as his latest, "Bright Lights, Bigger City," moves 8-7.

* At No. 40, legendary singer-songwriter Paul Simon earns his first chart hit in a decade with the title track from his new release, "So Beautiful or So What?" Simon hit No. 15 in 2001 with "Old" from the CD "You're the One."

* Fifteen songs move up four or more positions this week. The biggest mover is Mary Mary's aptly titled "Something Big," which sprints 29-15. Near the top of the charts, Jason Aldean and Kelly Clarkson's "Don't You Wanna Stay?" gains steam after 17 weeks on the survey, pushing 7-3.