Illumination Entertainment’s upcoming animated movie Sing has a pretty stacked voice cast that includes Matthew McConaughey, Reese Witherspoon, Seth MacFarlane, Scarlett Johansson, John C. Reilly, Taron Egerton, Tori Kelly, Nick Kroll, Beck Bennett, Nick Offerman, Jennifer Saunders, Garth Jennings, Peter Serafinowicz, Leslie Jones, and Jay Pharoah.

But those aren’t the only people who lent their voices to the film, which follows a singing competition designed to save a struggling theater. If you look closely during the credits, you’ll see some unexpected names crop up. Specifically, directors Wes Anderson, Edgar Wright, and Chris Renaud (Despicable Me) all lent their voices to the movie. While we’re not sure if they actually did any singing, it wouldn’t surprise me if they did since the audition scene is a huge montage of various animated animals singing snippets of pop songs.

Universal has also released new images highlighting the main cast members, which you can check out below. Sing opens December 21st.