This is a 2fer reissue. I used to have the Cage/Riech LP which I loved. Cage's 3 Dances for Prepared Piano is probably my single most loved piece of his. Wonderful stuff with lots of gamelanish sounds. 4 Organs is about as minimal as Steve Reich gets and is pure process music: 1 chord gradually extended for a period of over 20 minutes. If you liked Drumming, you may like this (I do) but like much of Reich's early work it is very dry.
The big surprise was the early 2 piano version of the Rite of Spring, which I didn't even know existed! According to the notes, this was a sketch version of the piece that was used during the dance rehearsals, while Stravinsky was still orchestrating and tweaking the piece. It works very well. Sort of akin to Mussorsky's Pictures at an Exibition, comparing the original piano version with the later orchestration. (Except that here, the same composer did both.....)
The only problem is that the sound quality of this piece is a bit distorted at times, and sounds like it was recorded in the back of the recital hall. But the quality isn't that bad...
Overall, very much worth the reasonable price of admission.