(PITTSFIELD and STOCKBRIDGE, Mass.) – Country singer Travis Tritt, jazz pianist Ahmad Jamal, former Men at Work frontman Colin Hay, soul singer Bettye LaVette, innovative classical-crossover ensemble Turtle Island Quartet, Americana rockers Tarbox Ramblers, Cajun stars BeauSoleil avec Michael Doucet, instrumental folk duo Jay Ungar & Molly Mason, singer-songwriter Carrie Newcomer, and traditional Irish ensemble…