For a fourth straight week, 50 Cent's "21 Questions" featuring Nate Dogg reigns atop of Billboard's Hot 100. Even so, the single is starting to show signs of wear, and loses the No. 1 post on Billboar

For a fourth straight week, 50 Cent's "21 Questions" featuring Nate Dogg reigns atop of Billboard's Hot 100. Even so, the single is starting to show signs of wear, and loses the No. 1 post on Billboard's Hot R&B/Hip-Hop Singles & Tracks chart, where it had ruled for seven weeks. Monica's "So Gone" jumps 4-1 on that tally, the beneficiary of a spike in airplay. On the Hot 100, "So Gone" climbs 14-11. Her J Records album "After the Storm" will be in stores Tuesday (June 17).

On next week's chart, 50 Cent is likely to take a back seat to a pair of "American Idol" contestants. Singles from second-season winner Ruben Studdard and runner-up Clay Aiken were officially released June 10, but a number of retailers put them on shelves early. Initial sales are strong, and the two are expected to capture the top two slots on next week's Hot 100.

Studdard's single a cover of Westlife's "Flying Without Wings" has sold about 1,000 copies in the U.S., according to Nielsen SoundScan. That's good for a No. 22 post on Billboard's Hot 100 Singles Sales tally. The retail single also boasts a cover of the Carpenters' "Superstar."

Second-place finisher Aiken, however, is so far outselling the Studdard. His single, "This Is the Night," has sold about 1,500 units, placing it at No. 19 on the Hot 100 Singles Sales tally. The commercial single also features a cover of Simon & Garfunkel's "Bridge Over Troubled Water."

Projections have both RCA Records Group singles selling more than 200,000 units. Meanwhile, the best-selling single in the U.S. for the seventh week in a row is "God Bless the U.S.A." from the second-season "American Idol" finalists.

The Hot 100's fasting-growing track at radio is Ashanti's "Rock Wit U (Awww Baby)." Moving 15-10 on the chart, the track reaches a new peak position this week. It was a little over a year ago when her "Foolish" topped the singles chart.

The single that saw the largest sales gain on the Hot 100 is "Frontin'" from Pharrell Williams featuring Jay-Z. It's only the second week on the chart for the song from the artist, best known for his work in N*E*R*D and production duo the Neptunes. "Frontin'" will be featured on the upcoming Neptunes compilation "Star Trak Presents Clones," due Aug. 5 from Star Trak/Arista.

The Hot 100's top debut is "Swing, Swing" from the All-American Rejects at No. 71. The rest of this week's entries are George Strait's "Tell Me Something Bad About Tulsa" (No. 72), "Nashville Star" winner Buddy Jewell's "Help Pour Out the Rain (Lacey's Song)" (No. 86), and Dierks Bentley's "What Was I Thinkin'" (No. 90).

On Billboard's Hot Country Singles & Tracks roundup, Toby Keith's duet with Willie Nelson "Beer for My Horses" tops the tally for a second-straight week. Further down, "It's Five O'Clock Somewhere" from Alan Jackson & Jimmy Buffett lands at No. 31, the highest debut on that chart in 2003.

Audioslave's "Like a Stone" leads Billboard's Mainstream Rock Tracks chart for a 10th straight week. Jane's Addiction's "Just Because" bolts 37-21. On the Modern Rock Tracks chart, Trapt's "Headstrong" rules the roost for a fourth week in a row, while the Jane's track jumps 27-12.