"Jim Dandy" was an Ellington tune for the musical "Chocolate Kiddies".
Flemming was born Nicolaiih El-Michelle, and was of North African descent. Flemming studied music and played mellophone and euphonium at Dobbs Chauncey School in Dobbs Ferry, New York before switching to trombone. He was a member of James Reese Europe's 15th New York National Guard Band with Eugene Mikell, and then Europe's 369th U.S. Infantry Band in France in 1917. (Thanks to Wiki).