It's been ages since I've been to a Renaissance festival. I was overdue. Huzzah!
We went for the jousting Sunday at The Four Wind Faire and stayed for The Brobingnagian Bards, an Austin-based duo performing Scottish and Irish drinking songs with the period instruments and the upbeat humor you hope for in such venues.
I was happy to discover they had a website, one member has a podcast and they're well represented on iTunes. They're veterans of science fiction conventions as well as festivals so there are Jedi tunes in their repertoire as well as many an Irish tune.
My favorite song, being a cat owner, is Marc Gunn's solo effort Danny Boy, to the tune of Londonderry Air, sung by a cat owner roused in the wee hours by his feline friend.