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Bang on a Can Marathon Six hours of hard-charging new music, and you can come and go as you wish. Terry Riley (right), a granddaddy of minimalism, will be a special guest and the bill also includes works by Frank Zappa as well as a collaborative mixed-media oratorio called "Shelter." At a recent Bang on a Can Marathon in New York City there were reports of a mosh pit and crowd surfing. Hang 10, North Adams. Saturday at 4 p.m., Mass MoCA, 413-662-2111, massmoca.org
- Jeremy Eichler
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