The band at the Sports Bar is the same group that's been there for years. I had not heard about a jam at the Split, though. Dur d' Woods, just by the airport seems to be trying to get a Sunday afternoon jam started also, though I have not been.
Yes, Valentino is usually in the band at the Friday jam. He also provides the Tuesday night music at the sports bar. Not sure if that's still an open mic he hosts or if he just performs now. And he does a mean Johnny Cash.