I love Frank Zappa's instrumental/experimental period from the late 60's/early 70's.  That's probably why I love the Grand Wazoo.  While I haven't heard the entire disc, I can safely say this is one mighty fine album.  These instrumental jams are atmospheric, adventurous and as creative as a jam can possibly be.  The way Frank Zappa used to write music is just really incredible.  Being experimental really *is* the way to go, for long-lasting satisfaction.  While Hot Rats is his masterpiece, the Grand Wazoo is probably his next best album.  Jamming done right!