Week of July 11

At the top of the charts, Katy Perry and Snoop Dogg's "California Gurls" finally yields to the Zac Brown Band's "Free" after a five-week run, the longest of any song so far in 2010. Elsewhere, the large chart logjam of last week breaks in a big way, with songs from MercyMe, Adam Lambert and Lady GaGa plummeting and strong moves for Erik Hassle (16-12), Janelle Monae and Big Boi (17-13), the Steve Miller Band (18-14) and One Eskimo (24-17).

A mini logjam in positions 5 through 9 means Nikki Yanofsky is living up to the title of her first hit. "Cool My Heels" has now been No. 7 for a month, joining chartmates Sharon Jones and the Dap-Kings (No. 6) and the Rolling Stones (No. 5) for four consecutive weeks in their respective positions.

Two down, 48 to go: Melissa Etheridge debuts this week at No. 36 with the "Fearless Love" album track "Indiana." This isn't her first time in the Top 40 with a title referencing a state. "California" went to No. 39 in 2007. (Wonder what "Rhode Island" or "Oregon" might sound like?)

Enrique Iglesias storms the charts this week, with two tracks from his new release "Euphoria" entering the Top 40 and another chartbound. All three feature guest performers. At No. 32, he has the week's highest debut with "One Day at a Time" featuring Akon. At No. 39, "I Like It" marks the first Top 40 appearance on my charts for rapper Pitbull. And Pussycat Dolls lead singer and "Dancing With the Stars" champion Nicole Scherzinger is chartbound on Iglesias' "Heartbeat." These collaborations aren't the first ones to score for Iglesias. Last year, he and Ciara hit No. 13 with "Takin' Back My Love." And a decade ago, he and Whitney Houston teamed up on "Could I Have This Kiss Forever?" which went to No. 7.

At No. 34, Ed Kowalczyk, the former lead singer of the group Live, debuts with his first solo hit, "Drink (Everlasting Love)." And at No. 33, "Don't Wake Me When It's Over" marks Lifehouse replacing itself in the countdown as the band's former No. 1, "It Is What It Is," drops out this week.