Between 1989 and 1991, Paula Abdul racked up six No. 1 hits on the Hot 100, beginning with "Straight Up" and concluding with "The Promise of a New Day." The latter was the second single from her sophomore album "Spellbound." However, the set's first single, "Rush Rush," is Abdul's longest-running No. 1, with five weeks atop the list in 1991.

Equating racial harmony with the peaceful coexistence of the black and white keys "side by side on my piano," this superstar pairing from McCartney's "Tug of War" album spent seven weeks a No. 1 in the spring of 1982. Although savaged by critics as sappy, the cut became the longest-running No. 1 of Wonder's career as well as McCartney's post-Beatles period.

This unabashed one-hit wonder has been a sporting event staple for nearly 15 years. The song hit No. 1 on the R&B;/Hip-Hop chart in 1993 and spent seven weeks at No. 2 on the Hot 100. Later that year, it was the theme song for the 1993 Philadelphia Phillies, all the way through their trip to the World Series.

Introduced in the boundary-busting musical "Hair" in 1967, this track later became a multiformat hit for the 5th Dimension two years later. Based on the belief that mankind would begin an age of enlightenment at the end of the 20th century, "Aquarius" spent six weeks at No. 1 in 1969 and earned Grammys for record of the year and best contemporary vocal performance by a group in 1970.

Jett first heard this song on a TV series hosted by London-based American rock trio the Arrows, who wrote it. In the mid-1970s, she tried to convince her band the Runaways to cut it but they declined. The singer recorded it after that band broke up; a different version went on to spend seven weeks at No. 1 in 1982.

Crowned by fans the "King of Freestyle," Miami-born Steven Bernard Hill made his mark with uptempo dance jams like "Party Your Body," "Spring Love (Come Back to Me)" and "I Wanna Be the One," but it was this ballad that gave him his biggest Hot 100 hit. The song spent four weeks at No. 1.

This musical tug-of-war had one of the highest jumps to the top in Hot 100 history, leaping 23-1 in 1998. It was the first No. 1 for both artists - and though they denied the song reflected any actual rivalry between them, co-producer Rodney Jerkins claims he remixed "Boy" seven times to keep everything even.

"All through the taping of 'Starting Over,' I was calling what I was doing 'Elvis Orbison,'" Lennon told Rolling Stone in 1980. "I'm a born-again rocker, I feel that refreshed." It was more than bitterly ironic that a tune which found Lennon looking forward with renewed hopefulness was his last to enter the Hot 100 in his lifetime. The song went on to reach No. 1 on Dec. 27, 1980, 19 days after Lennon was killed.

The J. Geils Band's only Hot 100 No. 1, "Centerfold" spent six weeks at the top in 1982. The uptempo rock tune - no doubt aided in popularity by its schoolgirls-in-lingerie music video-also surprisingly hit No. 12 on the Hot Dance Club Play chart. It was followed by another pop smash, the No. 4 single "Freeze Frame."

Swede success was prevalent on the Hot 100 in the early '90s. Roxette ruled with "It Must Have Been Love" and "Joyride," while fellow Swedish act Ace of Base picked up the baton with "The Sign." After making its Hot 100 debut Jan. 1, 1994, the song hit No. 1 for four weeks beginning March 12 and then returned for two more weeks in May, becoming the first title since Men at Work's "Down Under" in 1983 to revisit the penthouse in a chart run after temporarily ceding it. All in all, "The Sign" spent the lion's share of 1994-41 weeks-on the Hot 100. The pop hit helped make its creators a memorable sign of their times. In a 1999 "South Park" episode, an unfrozen man-from the olden days of 1996-had his memory jogged when played the sounds of that omnipresent band of his day, Ace of Base.