Sean Paul is the latest leader on a rapidly changing Hot 100 while Mary J. Blige has the top of the R&B/Hip-Hop Songs locked up. Plus notes on Brad Paisley and Pearl Jam.

'TEMPERATURE' RISING: The very rapid turnover of No. 1 hits on the Billboard Hot 100 continues, as Ne-Yo's "So Sick" (Def Jam) yields to Sean Paul's "Temperature" (VP/Atlantic). With "So Sick" falling after two weeks on top, "Temperature" becomes the sixth No. 1 of the year. This is the earliest the sixth No. 1 of a calendar year has shown up since 1991, when Mariah Carey's "Someday" became the sixth No. 1 the week of March 9.

With Paul following Ne-Yo, who succeeded James Blunt, this is the first time three solo male artists have ruled the Hot 100 consecutively since October 1990, when Maxi Priest's "Close to You," George Michael's "Praying for Time" and James Ingram's "I Don't Have the Heart" were adjacent chart-toppers.

The luck of the solo male artist may extend to Daniel Powter, who is having a good week with "Bad Day" (Warner Bros.). That single is up 5-2 and is in striking distance of pole position. If it does go all the way, it would be the first time four solo males have held the No. 1 spot on the Hot 100 consecutively since 1988, when George Michael's "Father Figure," Rick Astley's "Never Gonna Give You Up," Michael Jackson's "Man in the Mirror" and Billy Ocean's "Get Outta My Dreams, Get Into My Car" were successive No. 1 singles.

"Temperature" is the third chart-topper for Paul. He first reached No. 1 in May 2003 with "Get Busy." Five months later he was on top again, paired with Beyoncé on "Baby Boy."

NO TURNOVER AT ALL: Unlike the Hot 100, where the turnover of No. 1 songs has been lightning-quick, there has been literally no turnover at all on Billboard's Hot R&B/Hip-Hop Songs chart. On the first chart of the year, Mary J. Blige advanced to No. 1 with "Be Without You" (Geffen) and she remains there, 13 weeks later, the only song to rule this list in 2006.

When the next No. 1 of the year finally does show up, it could be the latest the second No. 1 song of a calendar year has shown up since 1947. After a 17-week non-consecutive reign, "Ain't Nobody Here But Us Chickens" by Louis Jordan and His Tympany Five finally gave way to their own "Texas and Pacific" the week of April 26, 1947.

At the 13-week mark, Blige's "Be Without You" is the second longest-running No. 1 since the R&B chart was reintroduced in 1965. The only songs to have longer reigns are "Nobody's Supposed to Be Here" by Deborah Cox in 1998 and Mariah Carey's "We Belong Together" in 2005. Both remained on top for 14 weeks.

'WALK' THE WALK: An 11-8 move for "Walk Away" (RCA) on Billboard's Adult Top 40 chart makes Kelly Clarkson the first artist in the 10-year history of this tally to score five top 10 hits from one album.

Clarkson's record-setting run began with "Breakaway," the title song from her second album. Featured in the movie "The Princess Diaries 2," "Breakaway" peaked at No. 2 in February 2005. Then, "Since U Been Gone" also peaked at No. 2, in May 2005. The third single, "Behind These Hazel Eyes," spent five weeks at No. 1, starting in August 2005. "Because of You" was next, and it peaked at No. 2 in December 2005.

'WORLD' MUSIC: Brad Paisley scores the highest-debuting song of his career, with the No. 37 bow of "The World" (Arista) on Billboard's Hot Country Songs chart. That beats the No. 48 debuts of "Two People Fell in Love" in March 2001 and "Whiskey Lullaby" in April 2004.

"The World" is the fourth single to debut inside the top 40 portion of the chart this year, following the No. 33 entrance of "What Hurts the Most" by Rascal Flatts, the No. 35 bow of "When the Stars Go Blue" by Tim McGraw and the No. 36 opening of "Love Will Always Win" by Garth Brooks and Trisha Yearwood.

'WORLD' MUSIC II: Pearl Jam's label debut on J gives the band its first No. 1 on Billboard's Modern Rock Tracks chart in almost 10 years. "World Wide Suicide" is the group's third No. 1 on this chart, and the first since "Who You Are" in September 1996. The first modern No. 1 for Pearl Jam was "Daughter" / "Yellow Ledbetter" in January 1994.

"World Wide Suicide" is also the Hot Shot Debut on the Billboard Hot 100, at No. 41. That is Pearl Jam's highest debut on this chart since January 1998, when "Given to Fly" opened at No. 23. "World Wide Suicide" is already Pearl Jam's highest-ranking song since "Last Kiss" peaked at No. 2 in June 1999. That remake of a J. Frank Wilson & the Cavaliers pop hit from 1964 remains Pearl Jam's biggest Hot 100 hit to date.