What would be some good songs to play on an instrument and sing for a Shakespeare show?

I am auditioning for A Midsummer Nights Dream this week and we have been given the opportunity to play an instrument and sing along with our monologues for the audition. I play the Viola, however, I can translate almost any song to my instrument so It can be for almost any instrument. I was thinking something along the lines of the Shakespearean era but it can be close enough to that. I need to know by tomorrow night at the latest!