 Sonny Rollins, 1956 version of Mac the Knife from the historic album Sax Colossus. Moritat. It's called Wilfried Wald. It's warm. It's lyrical. It's swinging. It's wonderful. What can you tell us about this recording? Again, that's a theme that a lot of jazz musicians like because it's a very rudimentary theme, sort of like I Got Rhythm. And there's lots of room for variations in it, you know, once you get that theme down. I mean, most of the sheet music is in C.