In C

In 1964 a composer called Terry Riley composed a piece of music called 'In C'.

From Wikipedia:
In C consists of 53 short, numbered musical phrases, lasting from half a beat to 32 beats; each phrase may be repeated an arbitrary number of times. Each musician has control over which phrase he or she plays: players are encouraged to play the phrases starting at different times, even if they are playing the same phrase. The performance directions state that the musical ensemble should try to stay within two to three phrases of each other. The phrases must be played in order, although some may be skipped. As detailed in some editions of the score, it is customary for one musician ("traditionally... a beautiful girl," Riley notes in the score[2]) to play the note C (in octaves) in repeated eighth notes. This functions as a metronome and is referred to as "The Pulse".

In C has no set duration; performances can last as little as fifteen minutes or as long as several hours, although Riley indicates "performances normally average between 45 minutes and an hour and a half." The number of performers may also vary between any two performances. The original recording of the piece was created by 11 musicians (through overdubbing, several dozen instruments were utilized), while a performance in 2006 at the Walt Disney Concert Hall featured 124 musicians.

The piece begins on a C major chord (patterns one through seven) with a strong emphasis on the mediant E and the entrance of the note F which begins a series of slow progressions to other chords suggesting a few subtle and ambiguous changes of key, the last pattern being an alteration between B♭ and G. Though the polyphonic interplay of the various patterns against each other and themselves at different rhythmic displacements is of primary interest, the piece may be considered heterophonic.

Here's part one of the original recording:



Then, in late 2008, the Grand Valley State University New Music Ensemble decided to make a new recording of 'In C'.

Their idea was to release a double CD - one disc with their performance in full and a second disc of remixes.

The project is now complete and you can hear the results here:


You can also get an insight into the project from the remixers point of view by listening to this week's Radiolab podcast from WNYC.