Powered by the robust lead voice of Rochelle Fleming, First Choice were key to the disco movement and well-established years before the style went mainstream. The Philadelphians scored their first hit in 1973 with "Armed and Extremely Dangerous," a Top 40 pop single aided by long-term collaborators Norman Harris and Allan Felder. After they placed four additional singles in the Top 40 of the R&B chart, the group's already-considerable value to DJs and clubbers increased dramatically. A series of Top Ten disco singles included "Doctor Love," the lead single from 1977's Delusion...