One of the unsung British progressive bands of the early 1970s, the Strawbs differed from their more successful compatriots -- the Moody Blues, King Crimson, Pink Floyd -- principally in that their sound originated in English folk music rather than rock. Their transformation from acoustic bluegrass outfit to progressive folk-rock innovators was an impressive feat, and they hit their stride with gems like 1972's Grave New World and its follow-up, Bursting at the Seams. As the '70s wore on, the Strawbs' career began to falter with ongoing lineup and label changes marring their p...