Supersister was a Dutch band from The Hague, Netherlands, playing progressive rock ranging from jazz to pop. The most predominant band members were Robert Jan Stips (keyboards, vocals), Sacha van Geest (flute), Marco Vrolijk (drums) and Ron van Eck (bass).
The band started as Sweet OK Sister in 1968 as a school band with singer and songwriter Rob Douw, who soon thereafter left. The remaining members continued as a more serious musical quartet under the name Supersister. Their style was progressive rock (in Canterbury Scene style) in which Stips' keyboard play played a dominant role.
Their debut was the 1970 album, Present from Nancy, with charting singles such as "She Was Naked", "A Girl Named You", and "Radio". After three albums (Present from Nancy (1970), To the Highest Bidder (1971), and Pudding en Gisteren (1972)) van Geest and Vrolijk quit. The remaining crew, together with new members Charly Mariano (wind instruments) and Herman van Boeyen (drums) released the album Iskander in 1973, which is a jazz-rock oriented concept album based upon the life of Alexander the Great.
In 1974, Stips and van Geest released a final album, Sweet Okay Supersister, which marked the end of the band.
The band reunited in 2000, after a request by the Progfest festival for a performance in Los Angeles. The four 1970-1973 period band members decided to accept and the result was the requested performance, as well as a short tour through the Netherlands in late 2000 and early 2001. To mark the occasion a rarities album was released, called M.A.N. featuring live and studio recordings from 1969-1973. The reunion abruptly came to an end when van Geest unexpectedly died in the summer of 2001. The reunion concert at the Paradiso in Amsterdam was recorded and later released on CD (Supersisterious, 2001) and DVD (Sweet OK Supersister, 2006), which also featured several old and new documentaries, photographs and unreleased audio tracks.
There was a picture featured on the video for "(They Long to Be) Close to You", with Karen Carpenter posing next to a Supersister poster.
The complete discography is available from the entry in the Dutch Supersister Wikipedia page.