Ive always loved Discreet Music - perhaps because its the biggest mind-fuck Ive ever heard. It's Pachelbel's Canon in D Major (you'd certainly recognize it) wherein he varies the tempo of each instrument by its pitch. Bass slows down, violins speed up. Your mind can compensate for the first minute or so, then it breaks down and becomes dissonant but comes back together at the end. Eno is one strange genius. Don't expect to actually "enjoy" any of his music, though. It's beautiful because its challenging, but very ambient (if that makes sense). edit to add: fwiw, the rumour I heard (and helped along) was that Eno was underneath the stage during U2's Zooropa tour twisting knobs and hitting buttons. personally, ive always thought he's a better producer than a performer.