The Blackpool, England group Complex concocted a sound -- a breezy mix of bubblegum, leftover psychedelia, and early traces of prog -- that proved to be a hard sell in the early '70s. They spent the bulk of the decade playing local clubs and making demos, trying and failing to reach the big time. Neither of their self-recorded albums -- 1970's Complex and 1971's The Way We Feel -- scored the band a record deal, and they finished their career hustling for a break that never came. Complex's legend grew over time, and eventually their recordings became sought-after rarities. With...