Which was the longest musical performance in history?

Longest piano concert - world record set by Romuald Koperski

Polish pianist Romuald Koperski, 54, got a thunderous ovation after he finished his 103 hours and 8 seconds piano recital at "Alfa Centrum" shopping mall - setting the new world record for the Longest piano concert. *

http://www.worldrecordacademy.com/arts/longest_piano_concert_world_record_set_by_Romuald_Koperski_101530.htm