The stars of Galavant have to be way up on their music game to stay in form for every episode of the ABC musical comedy, so it's no surprise they often get songs stuck in their heads. What is surprising though, is exactly what tunes they can't shake!

Ahead of Galavant's Sunday season finale, TVguide.com caught up with cast members Karen David (Isabella), Timothy Omundson (King Richard), Mallory Jansen (Madalena) and Luke Youngblood (Sid) to find out what apps they can't live without, their best impressions and, of course, the song that's perpetually stuck in their heads.

Galavant's Season 2 finale airs Sunday Jan. 31 at 8/7c on ABC.