Bang on a Can Marathon

This stalwart new-music collective takes up residence at MASS MoCA every summer, runs a seminar, and showcases faculty and student work in public performances. A highlight is the Berkshires edition of the Bang on a Can Marathon, which this year features a typically eclectic spread of works over six hours, from new-music classics by Arvo Part and Steve Reich to more recent works by Christine Southworth and Tom Johnson. - Jeremy Eichler, Globe Staff