The MoJazz label of the 1990s started very strongly and then quickly fizzled out. Steve McKeever was a main mover behind it and was associated with various quality releases of the time, but it's quite likely that the move to "urban" styles, conveniently cheaper to make (until the name producers starting costing more than full orchestras) put paid to the Norman Connors type of productions that promised so much at the beginning. I think the second album by Impromp2 was the final release for the imprint.
Speaking of unreleased stuff, there's supposed to be a full album by Jean Carne in the PIR vaults. Tawatha Agee was signed to PIR at the time she did backing vocals for Jennifer Holliday's "I'm on your side" album in 1991.
Brenda and the Tabulations' "I keep coming back for more" LP from 1977 was recorded at Sigma Sound, produced by John Davis, Bobby Eli and Norman Harris...