Molsky’s Mountain Drifters at One Longfellow Square – Tradition steeped in possibility. Bruce Molsky, Grammy-nominated artist on fiddle, banjo, guitar and song is delighted to present his new group already on tour in the US. Allison de Groot combines wide ranging virtuosity and passion for old-time music. Like Bruce, Allison loves collaborating and bringing new ideas to old music, and brings a fresh approach to the trio. Boston-based Stash Wyslouch is one of bluegrass’s great young genre-bending pioneers. Coming over from the punk-metal world, Stash brings great sensitivity and real emotion to the trio, plus some superb guitar and vocal chops. 8-10:30pm. $20 adv./$25 day of. FMI: onelongfellowsquare.com.