Very nice mixed session on Monday nights at the Tass Bar - corner of Royal Mile and Jeffrey St. Its hosted by the fiddle/guitar duo of Andy Lyons and Ian Main, who are a) great players and b) very friendly. There will be tunes, unaccompanied singers, and singer guitarists. Being a Monday its not too crowded or noisy, people actually listen to the music, and you get a good atmosphere.

The Tass has other sessions on Wednesday, Thursday, Friday and (i think) Saturday -getting generally louder as you go through the week...
cheers
KP