"Opus" is a song by Swedish DJ and producer Eric Prydz. It was released as a digital download on 27 July 2015 as the fourth single from his debut studio album Opus (2016).[1] The song was written and produced by Eric Prydz and peaked at number three in Belgium.
"Opus" is an instrumental house track set to the F♯ minor key at a tempo of 126 beats per minute. It starts as a set of electronic synths set at 31.5 BPM and gradually builds up to a progressive house track as it continues to accelerate to 126 BPM in a range of three minutes and 42 seconds.
Opus was first played as the finale track for Prydz's 2015 set at EDC Las Vegas. In just over a month after first play, the song was released on Beatport.[5] It has been played as the penultimate track in all seven EPIC 4.0 sets this far.[6]