No soundtrack?

I thought I had read from the beginning that one of the ways they were keeping costs down for the show was the appearance and performance of some of the visiting musical guests, so I was surprised I couldn't find a soundtrack for the show... as well as surprised that it took all this time to think of looking for one.

I downloaded Trombone Shorty's 'O Holy Night' when they made it available, but I wish we could get other selections from the show... unless they were all played live during the taping.

I realize performing musical guests doesn't automatically equal soundtrack release, but is my mind completely making up that bit about the musical guests regarding the cost of the show? Other than them paying to be on the show, which I doubt happened, I don't see how they'd reduce costs in any way.