If you look around, you can find just about anything online. Greggory points to a part of the Internet Archive where someone has uploaded audio from dozens of cassette tapes (and a few reel-to-reels) that were sent to K-Mart outlets for in-store play. They contain music, announcements and other bits of retail ephemera.
Clicking below will bring up the chain’s 1974 Christmas tape.
Attention K-Mart shoppers, indeed. Click on the reel to hear more.