Scarlett & Black

This was a British duo of Robin Hild and Sue West. Both were sometime session singers and songwriters that met in 1983 in the studio while working with Doctor & The Medics (Sue was a back-up singer for them). "You Don't Know" was the first single from their self-titled debut album. It reached #20 on the US charts. The album was produced by keyboardist/producer Paul Fox and had Jane Wiedlin (Go-Go's) on backing vocals. Even Chris Squire, the guitarist from Yes, helped out on the track "Let Yourself Go" but chart success dodged them thereafter. (Source - found on the internet can't recall where)