As I said in a previous posting, the star should have been Martha and the Vandellas. This completely ignores the Vandellas part in the hit records. They were not the run-of-the-mill girl group. I wouldn't call them a girl group at all, they were too agressive, their call-and-response singing too gospel/r&b to be a girl group. I don't consider the Supremes to be a girl group either.
I've seen both grouping of Vandellas several times, and I've enjoyed Roz and Annette better than Lois and Delphine. It seems to me that Roz and Annette come out as Vandellas - the ones that backed Marvin so aggressively. And I don't think Martha cares for that. I've seen the Vandellas practically tip-toe around Martha in concerts, as Martha can be very mercurial.