“Johnny "Big Moose" Walker (1927 –1999) was a Chicago and electric blues pianist and organist. He worked with many blues musicians including Ike Turner, Sonny Boy Williamson II, Lowell Fulson, Choker Campbell, Elmore James, Earl Hooker, Muddy Waters, Otis Spann, Sunnyland Slim, Jimmy Dawkins and Son Seals.
In addition to his virtuoso piano playing, Walker was proficient on the electric organ and bass guitar, playing the latter instrument when backing Muddy Waters. As well as playing accompaniment to other musicians in both concert and recording arenas, Walker recorded a small number of solo albums.
https://en.wikipedia.org/wiki/Johnny_%22Big_Moose%22_Walker#Blues#LastJams#LongLiveTheJams#GoingDownJamming#tillthewheelsfalloff”