"Pjanoo" (Swedish pronunciation: [ˈpjɑːnʊ]) is a keyboard-based house track by the Swedish DJ and producer Eric Prydz. It has received moderate airplay amongst British radio stations, being heavily used by BBC Radio 1 in advertisements for their "Radio 1 Big Weekend" and "Weekend in Ibiza" events. The single peaked at number six on the Swedish Singles Chart. "Pjanoo" found success outside Sweden, particularly in the United Kingdom, where it peaked at number two on the UK Singles Chart and topped the country's Dance chart for ten non-consecutive weeks.

The song has been on promotional release since 17 March 2008 with Eric Prydz's own label, Pryda, with a limited number of 12" pressings available on special order. The song was released on 25 August 2008 by Ministry of Sound's Imprint Label, Data Records.

Prydz stated: "I played it in a club in northern UK in 2006. Didn't get the reaction I thought I would, so I didn't play it for years until I found the CD while playing at 'Ambasadeur' club in Stockholm. Played it for fun again and it went off. Someone filmed it and it ended up on YouTube."

British drum and bass producer High Contrast has made a successful drum and bass remix of "Pjanoo" and was released by Data Records on 26 August 2008 with a track length of 7:43. The piano riff was inspired by the piano in Patrice Rushen's song "I Was Tired of Being Alone".

Despite showing overall resentment towards Prydz, Pitchfork nonetheless conceded that the song was "one of the year's best dance tracks".

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