After the departure of Jerry Butler, Curtis Mayfield took creative control of the Impressions in 1961 and had a big hit right off the bat with "Gypsy Woman." Soon, his civil rights beliefs were showcased in hits such as "Keep On Pushing," "Meeting Over Yonder" and "People Get Ready." The big surprise here is how good the B-sides are. It's 60 tracks long, yet even novelty tunes like "Twist and Limbo" and forgotten ballads such as "Long Long Winter" are essential (even the cover of "Up Up and Away" comes out on top). Though Mayfield's leadership lasted until 1970, this set ends in 1968.