Discreet Music is quite a lengthy CD. The actual piece Discreet Music is over half an hour long and evokes Eno's wonderful Music for Airports.
Also included are three related pieces and this, Fullness of Wind, is the first of three variations on the Canon in D Major by Johann Pachelbel. It's the best of the three - and well worth a bang.
Eno fragments, overlays and slows different parts of the original score to create a beautiful ambient work. Kinda Steve Reich meets Godspeed you Black Emperor (without the guitars).