You know the routine, Conrad. Please post what lyrics and background information you have - or did you just find the title on iTunes and nothing more?
I found "The Swank Wassail Song" on Spotify. It was recorded by Geoffrey Leigh Tozier on his A Very Swank Christmas! album. It's enough to make me gag, and I really don't care to go to the effort of transcribing it.
-Joe Offer-