Song Brainworm Squished

This has been driving me crazy for almost two years. On satellite radio back in 2005 I heard the song "Do You Wanna Funk" by Patrick Cowley & Sylvester. The song was familiar; I was certain I'd heard it in a movie soundtrack, but I absolutely could not place it. And the web was no help.

This morning I heard the song again, so I tried searching again, and this time found it. According to The Fabulous Sylvester: The Legend, the Music, the 70s in San Francisco by Joshua Gamson, as scanned and indexed by Google Book Search, the answer is... Trading Places. I think it's the scene where Billy Ray Valentine reacts to his newfound privilege and riches by throwing a party in his home.

Note that the book is copyrighted 2005, which means it might not have been in print yet when I first did my search. Thank you, Joshua Gamson! Thank you, Google Book Search!

Update: Trading Places, not Spaces! Aargh, my domesticity is showing!