The Tin Angel is located above Serrano restaurant on 2nd Street between Market and Chestnut. It's a great place to catch some live music in a relatively small, intimate space. Check out the website for details, including booking tickets online. There is a small bar upstairs, but you can also get a better deal by eating at the restaurant below.
I was here in January of 2004 where I saw folk artists Ellis Paul and Vance Gilbert put on a great show.
City Paper, which is one of Philly's free weekly publications, named the Tin Angel the "Best City Venue for Moments of Unscripted Transcendence." Now that's a specific award, but a good one.
Dress Code: Come as you are