I opened for David at Mother Blues in 1973. He had his tour band with him (including a fellow that played "invisible harmonica" - incredible). It was in the "Blues Room" at the first Mother Blues location on Rawlings Street in Dallas, Texas.

There were several other luminaries in the crowd: B. W. Stevenson, and a weird guy named Frank Zappa *BG*. We sat at a table against the back wall, drinking Lone Star longnecks and generally clacking for the band while Frank drank plain water. After a particularly well phrased lick, Frank turned his face up to the ceiling and put his hands up in the "ya got me" pose. I'm not sure many of you know, Frank was the strictest band leader EVER. After it was all over, he turned to B. W. and said, "Infectious, huh? And I would have fired 'em . . .and re-hired 'em . . . and fired 'em."