As much as any record, CSN's 1969 debut ushered in the early '70s singer-songwriter boom. Yes, this was a group, but it was one made up of three coequal composer/vocalists, each with a heady resume--Crosby an ex- Byrd, Stills in Buffalo Springfield, and Nash a former member of the Hollies. Each supplied distinctive material and contributed to CSN's trademark harmonies. The addition of Neil Young made the supergroup an edgier outfit. There's a purity to the original trio recording, however, that would never be recaptured.