"I dropped the paper with the lyrics—right in the middle of the tune…And I did not want to stop and spoil the record which was moving along so wonderfully…so when I dropped the paper, I immediately turned back into the horn and started to scat…just as nothing had happened…When I finished the record I just knew the recording people would throw it out…and to my surprise they all came running out of the controlling booth and said—'Leave That In.'"

Louis Armstrong