Arnold Schönberg - Pierrot Lunaire op.21 and Erste Kammersymphonie op.9I'm posting this release, not for the Pierrot Lunaire, but for Schönberg's First Chamber Symphony (track 22). If you do wish to find out more about the former, you can follow this link.
Now, about the Chamber Symphony... I've been listening to this 21 minute piece of disturbing, yet immensely beautiful music for several years, and it really gets much better at every hearing. One of the first major works of modernist classical music, it can be well positioned besides Satie or Debussy. A big difference, however, is that this piece has a much harsher, more 20th century feel to it. On May 7th 2005, BBC radio aired an interesting 30 minute show about it (basically a musical analysis) which you can listen to in stream format here. I'll also post an mp3 recording of it shortly, in case you'd want to keep it for the future.