Soon it will be 50 years since Woodstock. Not sure what surprises more: the fact that seminal cultural event is coming up on a half-century or that some of its featured acts are still touring. Wasn’t rock ‘n’ roll a youth movement? Didn’t The Who’s Pete Townshend write the immortal line “Hope I die before I get old?” and sing it at Woodstock? Answers: Yes but not anymore. And yes Pete did, indeed, sing that line from “My Generation” on the third and last day of Woodstock on Aug. 17, 1969. This week, The Bethel Woods Center for the Arts...