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This probably isn't really an answer for this question, but Ben Pierce's recording on Wheels of Life is stellar. Not to downplay any other recordings of the Capriccio out there, but his is the only one that I've listen to so far. This is a very hard piece to really sing out and make sense of, but he plays with excitement and sensitivity.

Hehe.. True. BUT!.. If you listen to it you'll hear the right notes for the accidentals or lack there of.

Why not try this guy?
http://www.acu.edu/academics/cas/music/ ... trell.html

As far as I know, it is standard practice in unmetered music that an accidental only applies to one note. Also, in my experience, composers that write in such a way are less likely to foul up their accidentals than those who write a lot of accidentals in metered music - at least when you play/sing from a manuscript.

Micky Wrobleski, aided by Penderecki himself, wrote an article published in the 2001 Winter Issue of the TUBA Journal, pages 61-62. The article is meant to help tubists understand this particular piece, including tempo markings, typos and errors, and interpretation.

Hope that helps