PERSON@1 -LRB- , October NUMBER@1 NUMBER@2 -- August NUMBER@3 , NUMBER@4 -RRB- , was a legendary MISC@1 musician , primarily a singer of Qawwali , the devotional music of the MISC@2 -LRB- a mystical tradition within MISC@3 -RRB- .

He was a singer of qawwali , the devotional music of the MISC@2 -LRB- a mystical tradition in MISC@3 -RRB- .
