Otis Spann was the wonderful pianist that backed up Muddy Waters in his band. But Otis was a very talented singer and musician in his own right and recorded possibly my favorite blues album, entitled "Live the Life". It's got a bunch of wonderful blues piano pieces and some of Muddy Waters best slide work, of course laced with Spann's wonderful singing.
Otis Spann - T'aint Nobody's Business if I Do
Ignore the douchebag in the beginning...
Otis Spann - Cold Feelin' Blues
And another Muddy video just for fun... Dunno if Otis is in on this one.
Muddy Waters - 19 Years Old