Thanks for the welcome. I think that one of these nights I need to go to the DR and meet some of my fellow mongers. As for the live rock n roll, that's a pretty tough one. Especially if you are looking for a gringo place without having to go to the Key Largo.
From the top of my head, Bar la Salamandra in Tibas which is a tico place, the Jazz Cafe which is a very nice place in San Pedro sometimes has rock n roll band as well as K&S in plaza Crystal. Tonight, there is this rock n roll guy that's gonna be playing at planet mall in the Mall San Pedro but it's more of a concert and he sings in spanish. I'll see if I can find more places but in the meanwhile, this link should help with places to go.
http://www.clubzone.com/company/index.asp?state_prov=40By the way you guys usually meet everyday at the DR for happy hours?