Converting anything into heat is dead easy. Anything that absorbs sound is converting it to heat.
The comments section discusses, which includes
Sound energy is very low. The often quoted “fact” is that if a crowd in Wembley Stadium cheers very loudly for 1 minute, there is barely enough energy in that total noise to fry an egg.
Would be more efficient lighting their farts...
Ah the fabled penance fish, is attracted to any life form with a pulse.
Not sure a pulse is essential