It may be expensive, and two CDs of their work may seem like overkill, but this double-disc set is the one to get. Not only does it contain every hit and each single, and every B-side, from 1965's "Where Were You When I Needed You" through 1975's glorious "Mamacita," but the sound is extraordinary, far better than on any of the other hits compilations, and provides several revelations about the quality of their work. Highlights, in addition to the expected hits ("Let's Live for Today," "Midnight Confessions," "Two Divided by Love" etc.) include tracks like "Is It Any Wonder," with a chorus as radiant as anything the Mamas and the Papas ever recorded, and the seldom heard, vibrant "Mamacita." If you could never imagine listening to 120 minutes of Grass Roots material (this reviewer couldn't, either), this set will make you feel differently.