Back in the 1960s, you couldn’t swing an acoustic guitar without hitting a folk musician singing a protest song about something that was bugging him, usually something pretty specific. These days, overtly political music is rare, and specific issue-oriented songs are usually eschewed in favor of broader-themed anthems trumpeting such controversial concepts as peace and justice and brotherhood and so on. But a new CD released by aging folkies and frustrated teachers is taking direct aim at the Bush Administration’s controversial No Child Left Behind Act, with proceeds going to fund an alternative school that has been hurt by the act’s reforms.