"S Club Party" is a dance-pop song written by Mikkel Eriksen, Hallgeir Rustan and Tor Erik Hermansen for S Club 7's debut albumS Club (1999). Released in the UK on 20 September 1999, the song was produced by Stargate and received a mixed reception from music critics. It was released as the second single in the autumn of 1999 and reached the top spot in New Zealand and number two in Australia. It also reached the top ten in Ireland and the United Kingdom, where it was certified gold.
"S Club Party", the band's second single, is a song that is described as an "introduction to the band". Each line of the song's second verse describes a different member of S Club 7: "Tina's doing her dance, Jon's looking for romance, Paul's getting down on the floor, while Hannah's screaming out for more. Wanna see Bradley swing? Wanna see Rachel do her thing? Then you got Jo, she's got the flow, get ready everybody 'cause here we go". Following the departure of Paul Cattermole from the band, the band recorded a "United" version of the song with S Club 8, which omits the second verse and replaces it with the chant, "Ooh, ooh!" and extra ad lib vocals by S Club 8 vocalists Aaron Renfree, Frankie Sandford, Jay Asforis, Stacey McClean and Rochelle Humes.
The single contains two B-sides, Viva La Fiesta and Our Time Has Come. Viva La Fiesta later made the final tracklisting of the band's debut album, although Our Time Has Come remained as a B-side. Our Time Has Come was written at the same time as the band's debut single, Bring it All Back, and was again produced by Eliot Kennedy. The track was a contender to be the band's debut single alongside Bring it All Back, and was written as a contrast: while Bring it All Back features lead vocals from the girls, Our Time Has Come features lead vocals from the boys. Our Time Has Come was one of only three singles from the band's debut album era not to be performed on Miami 7, but it was performed live during the band's S Club Party - Live tour in 2001. Remixes by Dave Way and Jason Nevins were released on CD2, while the Australian CD single includes an extended version of "Bring it All Back".
The music video for the track was filmed in the Californian desert - in the famous setting of Vasquez Rocks - on the set of the Back to the 50s special. The fifties gang challenge S Club to a race, mirroring the famous race in Grease. The theme of the video is the United States in the 1950s. The group then sing "S Club Party" and they go on to win the race. Each member of the group also has their own "S" shot, where they draw an S in the sky whilst jumping in the air. When the group sing the song in the TV movie, Back to the '50s, it differs slightly from the music video. In the movie version, some scenes were cut out or shortened. In the music video, it shows some clips from the movie and all of S Club have more single shots including Hannah, Jon, and Tina. The music video version also has a different ending, with S Club dancing in front of the camera having fun and dancing in the back of a truck with everyone from the movie dancing around them.