Lately I've been enjoying the late solo "tributes" by Earl Hines. In addition to the Ellingtons (not my favorites), I've dug programs of Harold Arlen (2 discs), Cole Porter, Louis Armstrong, WC Handy, Hoagy Carmichael and two Gershwin discs.
My 2 favorites are the Gershwin program recorded for Carosello (I have both lps on a single Musidisc cd) and the Armstrong tribute.
I wish I still had the Dave Dallwitz program on Swaggie.