Instruct: Classify Amazon reviews into positive or negative sentiment
Query: An underground classic

Recorded at the height of anti-Jane Fonda hysteria, the movie and soundtrack were ignored and underplayed, yet it marks both Paul Butterfield's and Mike Bloomfield's first overture toward mainstream listeners. Add Maria Muldaur, and it is a rock & blues masterpiece, with a decided leaning toward early 1970's album oriented FM. Right where most of us boomers first heard the blues. Mike Bloomfield is in fine form... own this before "Live at the Old Waldorf".