Series of (mostly) instrumental compositions by Sonic Youth, recorded at their own studio and diffused by Steve Shelley's label Smells Like Records (btw, i ordered from them -- they ship fast, they're cheap - in a good sense, and they're reliable and generally cooool all the way).
The title of all records is "Musical Perspectives" in different languages:
There are rumours about Korean, Armenian, Irish, Arabic and Russian in the making.
The first three are original Sonic Youth compositions. The fourth was released at the end of 1999 and subtitled "Goodbye 20th Century" -- it consisted of the band's renditions of 20th century's avantgarde composers. The fifth was written and recorded not by Sonic Youth proper but by Kim Gordon, Ikue Mori and DJ Olive.
All these are highly recommended to lovers of adventurous, experimental, futuristic avantgarde rock-and-roll. If those are indeed the Musical Perspectives for the twenty-first century, then the modern art is heading in a good direction.