In Your Arms by Kevin MacLeod
A piece of music from a more elegant time, 1940. This is a beautiful slow piece that will make you want to pick up some champagne and go off slow dancing with people... or penguins. I like penguins. And now some searchable words: Big Band. 1940s. Forties. Formal Party. Penguin Slow Dance. No Whammies. You can download this in uncompressed format here. Download comes with individual tracks so you can make your own mixes.
Sounds like 40s jazz club big band