Has anyone seen any of the episodes when Muriel sings? She has a great voice! The episode when the family takes her out to a pirate-themed restaurant for her 42 birthday is one where she sings. She was awesome! Also the episode when an old friend of hers visits and they sing a duet together. I'm not sure if there are any other episodes that has her singing, but those are the only two that I've seen.

When she sings to Andrew Can't Help Falling In Love With You.