This is a video of the song "Hello, Dolly" being performed at a 1979 concert at Madison Square Garden in New York City by (are you ready) -- Louis Armstrong, Duke Ellington and Ray Charles! Yes, really. (The description also says B.B. King, though I can't see him in the video. That doesn't mean he's not there somewhere off-camera, but I can't swear to it.)
Just sit back and revel at a bit o' history.