The 5k Pursuit Opera, Act 1 (part 2) 

Pip Greasley's "5K Pursuit Opera" is a unique fusion of art and sport where track cyclists and opera singers interact through a wired up velodrome and sensors drive a computerised electronic score. The speed and tactics of the performers determines the tempo and outcome of the words and music. The cycle racing is for real and the winners and losers control the final plot.
First broadcast in 1991, the opera pioneered the use of interactive technology including sensors linked to C Lab's "human clock" software that translated speed into midi inputs to control the music tempo, and the innovative use of the EMS Soundbeam in transforming track positions into musical motifs. The system was controlled by three Atari computers that could instantaneously adjust the music score and libretto to whichever team was in the lead. This information was projected as notation and lyrics to be followed by the musicians and singers.