previously posted. Where the Glass pieces focus on strict notation, and work their hypnotic effect from repetition, addition and mutation, Terry Riley on the organ plays more freely around scales, modes and rhythm cycles. In a live performance such as this one, the first Riley album I picked up and still a huge favourite, this means lengthy droning improvisation with frequent bursts of high speed notes, like warp-speed transportation through the stars.
Descending Moonshine Dervishes was recorded in November 1975 at Berlin's Metamusik Festival, but wasn't released until 1982. Riley plays a single Yamaha YC 45D electric organ, the sound filled out by a specially built in delay and the trippy, distinctly Eastern-sounding melodies/harmonies resulting from the organ being retuned in Riley's preferred just intonation. Download and enjoy - preferably supine in a dark room.
Bonus Riley update, 20 August:
The new Rainbow In Cologne 2CD that I mentioned in the comments has landed! Pleased to say it's rather good. The recordings show their age a bit (both from 1971) but that's a tiny minus point compared to the performances, both on church organ. The hour-long ARICA is fantastic, and I might actually end up preferring the Persian Surgery Dervishes version to the Shandar originals. For the curious - here's a 15 minute Rainbow clip.