My two favorite phases of Ellington’s music... his late-1920s era, with hot numbers like “Jubilee Stomp.” And then, his late-30s/early-40s big-band era recordings, like “The Sergeant Was Shy” and “Main Stem.”
Ellington’s tune “It Don’t Mean a Thing” technically pre-dates the swing/big-band era by a few years. The Boswell Sisters recorded a really jaw-dropping version of it.