In celebration of the chart's 55th Anniversary, we're counting down the 100 biggest Hot 100 hits ever.

60

"The Sign" - Ace of Base

Hot 100 Peak: No. 1 for six weeks (1994)

Arista A&R VP Richard Sweret was on a Stockholm bus with Jonas Berggren of Ace of Base when the musician played him a new demo intended for the group's second album. Sweret loved "The Sign" and insisted the quartet record it immediately. He added it to the group's first album for its U.S. release and changed the CD title from "Happy Nation" to "The Sign."

59

"Apologize" - Timbaland feat. OneRepublic

Hot 100 Peak: No. 2 (2007)

While most people know this song is by OneRepublic, the artist credit is "Timbaland featuring OneRepublic" because the hip-hop artist signed the group to his Mosley imprint and remixed "Apologize" for his album "Timbaland Presents Shock Value."

58

"Gold Digger" - Kanye West feat. Jamie Foxx

Hot 100 Peak: No. 1 for 10 weeks (2005)

West wrote the song from a female point of view for rapper Shawna. When she didn't record it, he rewrote it for himself, and enrolled Jamie Foxx as a featured artist. The result was West's first No. 1 as a lead artist.

57

"I'm a Believer" - The Monkees

Hot 100 Peak: No. 1 for seven weeks (1966)

Music publisher Don Kirshner asked his friend Jeff Barry to find an even bigger hit to follow "Last Train to Clarksville." Barry was working with Neil Diamond and thought his song "I'm a Believer" would do the trick. The single had an advance order of 1,051,280 copies.

56

"Tik Tok" - Ke$ha

Hot 100 Peak: No. 1 for nine weeks (2010)

With nine weeks on top, this became the longest-running No. 1 debut single for any lead artist since Ashanti led the list for 10 weeks with "Foolish" in 2002.

55

"Lady" - Kenny Rogers

Hot 100 Peak: No. 1 for six weeks (1980)

Charting pop, R&B and country, "Lady" was the ultimate crossover hit and the first production work for Lionel Richie outside of the Commodores, resulting in Richie signing with Rogers' manager, Ken Kragen, for his solo career.

54

"Stayin' Alive" - Bee Gees

Hot 100 Peak: No. 1 for four weeks (1978)

Robert Stigwood was expecting a song from the Bee Gees called "Saturday Night, Saturday Night," so he was not happy to hear a demo titled "Stayin' Alive." Heard in a 30-second trailer played in theaters one week prior to the release of "Saturday Night Fever," a demand for the song was created before the LP hit the street.

53

"Let Me Love You" - Mario

Hot 100 Peak: No. 1 for nine weeks (2005)

Kameron Houff, who wrote the song with Scott Storch and a then-unknown Ne-Yo, remembers when their tune hit the top of the Hot 100. "Every week, my wife would look online and come into the bedroom and say, ‘Baby, it's No. 1.' It was like ‘Groundhog Day.' It was the greatest nine weeks of my life waking up and hearing her tell me every week it's still No. 1."

52

"Call Me" - Blondie

Hot 100 Peak: No. 1 for six weeks (1980)

Giorgio Moroder composed the music for the film "American Gigolo" and wanted Stevie Nicks to sing the title song. When she turned him down, Moroder asked Debbie Harry of Blondie to write the lyrics and record the movie's theme. "Call Me" was Billboard's No. 1 single of 1980.

51

"Boom Boom Pow" - The Black Eyed Peas

Hot 100 Peak: No. 1 for 12 weeks (2009)

will.i.am told Billboard that this song was, "made for underground clubs. Like, if I would have thought it was going to be a radio song, I would have made it different." Radio loved "Boom Boom Pow" just the way it was and the single became the Peas' first No. 1 on the Hot 100.

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