The Darrell Banks, J.J. Barnes, Roz Ryan all sound like they were recorded at United Sound, in Detroit (but, in 1967-69), The strings on William Bell, Johnny Taylor and other Stax/Volt artists sound like Detroit players (Detroit Symphony Orchestra players used by Motown/Golden World/Solid Hitbound). I'm sure all those Stax singers' vocals were recorded in Memphis. Maybe Don Davis recorded some Detroit artists' vocals in Memphis after 1969 (but, I don't follow '70s music). The Dynamics recorded in Tennessee before the end of the '60s (but that wasn't Don Davis). The Dramatics recorded in Memphis (maybe starting in 1969?-or was that 1970 or 1971?)