Do not be scared by the somewhat dubious exterior. On a recent Friday night, regulars and tambourine-wielding SMU types came together for an excellent evening of song. An older gentleman kicked things off with Bob Dylan’s “Things Have Changed,” and the kids took over when the liquid courage kicked in. What’s more, the crowd tolerated a newly engaged couple’s off-key warbling of “Going to the Chapel of Love” with a grace that bordered on enthusiasm. It’s the friendliest place to sing your guts out, amateur or otherwise.