You’re not seeing double – this week’s Creevey Tuesday features The Gringotts Grrls!

These twin librarians often brought medieval moods to their wizard rock performances, encouraging audiences to sing along in the round or keep a steady beat while they played flute, violin, and a variety of old-school percussion instruments. You can check out some of Mary and Deirdre’s performances on YouTube.

Thanks to Jonathon Rosenthal for the photo!