Otis Spann: Otis Spann Is the Blues (Candid, 1960)
Otis Spann, piano, vocals; Robert Lockwood, Jr.; guitar, vocals
Otis Spann, for those not familiar with him, was Muddy Waters' longtime piano player, and one of the finest blues piano players ever. Playing on virtually every Muddy Waters' recording (those that feature a full band) from the early 50s till the late 60s, Spann's solo output is limited. Unfortunately he died not long after leaving Muddy to begin a solo career.
Robert Lockwood, Jr. is one of the great underappreciated bluesmen/guitarists from the classic era. His mother and Robert Johnson were partners for a time. Lockwood is often referred to as Johnson's stepson, but I don't think was official and, in fact, Johnson was actually only a few years older than Lockwood. Lockwood is the only person to ever have received personal instruction from Johnson on the guitar. Sorta solidifies his blues standing by that alone, but Lockwood had a long (died in 2006) and varied career (if underrecorded and underappreciated one), as a sideman and solo act.
This is Spann's first album as a leader (or co-leader, since Lockwood's contributions are on par with Spann's, they mostly trade vocals every other song) and it's a great one. What's really wonderful is with only two musicians there is nothing to get in the way of Spann's piano and Lockwood's guitar. Just two great bluesmen sitting and playing. Spann's material tends to be Chicago-style blues and Lockwood's delta-oriented, though neither has any trouble shifting from one to the other (Spann was born in the delta and Lockwood was a sideman on many Chicago blues recordings during the 50s and 60s). Exceptional music, highly recommended, good sound.