Sound randomly stops after a few mins. Searched for this issue and other reports have been filed and marked as resolved, but as of 05-25-13 it is still happening for me. Sound on PC is fine, only stops for Minecraft Snapshot 13w21a. Sound returns after fully exiting program and restarting, but then stops again.
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Duplicate of MC-16150, please use the search function to see if your bug has already been submitted. Currently over 55% of tickets are being closed as duplicate.
i believe i am having the same problem, and have an idea of the cause.
for me no background music plays, then seemingly randomly all sound stops. looking at the console it only happens after it tried to play a sound file that it can't. ones i have seen cause it: piano1.ogg , nuace1.ogg , nuace2.ogg , though i believe all background music causes it as the error message seems to think they are in the sound file and not the music file.
temporary fix to keep other sounds working: turn music off.
as a side note that is likely relevant to this bug, music disks give a similar error but don't crash all the sounds.