We were welcomed at the door to the State Theater by a rep from Reverb, “a non profit organization dedicated to greening musicians’ tours and engaging their fans to take action to protect the planet.” The group was created by Guster’s Adam Gardner in 2004 to engage musicians and their fans in environmental work. This set the tone for the night: At this stage in their career, Guster seem dedicated not just to turning out albums, but also to changing the industry and mentoring new musicians. On this tour, they have committed to having young, local bands open in each city, a project they’ve described as a “home run” so far. It certainly was with Saturday’s opening act out of SUNY Purchase. Darryl Rahn and the Lost Souls brought to the State Trampled by Turtles-inflected folk, with lovely harmonies from their female vocalist and a skilled upright bassist adding a layer of depth.