There aren't a lot of musical groups that only have saxophonists, yet alone that utilize Jamaica Plain in their namesake. This Friday, you can hear such a group, the Jamaica Plain Saxophone Quartet perform live at Turtle Swamp Brewing. The musically adroit foursome are Sean Mix, Andy Wilds, Scott Chamberlin, and David Stevens. The group fielded questions from Jamaica Plain News about what they perform, whether they're all from Jamaica Plain, and more. Q: How long have you been playing together?