Mary
If they are the same versions as previously released, I think that is The Andantes with Martha on 'Heat Wave'. I love Martha's voice on this version.
Not sure about 'Stop! - I don't hear Jean in the background. It could be session singers, or just Scherrie and Lynda, or possibly Scherrie backing herself - as Carolyn Crawford did, on most if not all of her MotorCity recordings.
Roz & Nettie may not have backed Martha on any of her recordings. It could be The Andantes on 'Step into my shoes' - ?
I'd say Roz & Nettie are on background for Bettye LaVette's version of 'Jimmy Mack'. They did record two tracks themselves [['Running And Hiding' was one, can't remember the other offhand). Lois Reeves did a couple [[including 'Patience is a virtue') and Betty Kelly did at least one track, "Giving Me The Runaround", which I think is great and, for me, has a lot of sweet charm.
Gladys did most of the leads for the Marvelettes MotorCity sessions, with many of the tracks being released quite some time after the label folded. I think both Gladys and Wanda took only the leads, and didn't contribute to the backgrounds.
Hope that helps, and some of it is just my own opinion
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