Feldman’s String Quartet No. 2: A Marathon Performance (Aches, Too)

From NYTimes.com:

Composers have frequently tormented musicians with awkward or almost unplayable passages, but dehydration is a threat probably peculiar to those performing the second quartet by Feldman, an exuberant New Yorker who died in 1987 at 61. The Kronos Quartet backed out of a performance in 1996 because the physical pain became too much.