Mahler, Piano quartet in A minor (Pt 1 of 2)

Mahler's rare and short, Piano quartet in A-minor. only the first movement of this piece exists, and is often refered to when performed in concert (perhaps alongside other short Mahler pieces) as "Piano quartet movement in A-minor" According to Wikipedia, Mahler wrote this piece when he was around the age of 16-17, which is why I chose this photo of young Mahler.

http://youtu.be/kIekvye53gg