I've been looking for this song for years, as I've never heard it, but have wanted to. Randomly searched for it today and found that someone posted it to youtube.
The cast of A. R. Rahman's Broadway musical, Bombay Dreams, recorded Joy to the World for Broadways annual fundraiser Carols for a Cure.
Anyway, enjoy. It's never too early for Christmas...after all they're selling Christmas merchandise in the stores already.