I had never heard of this until Mark mentioned it in another thread. I intended to post it here along with asking who everyone thought was on background since Mark says there's some argument that it's either Flo and Mary or the Andantes. But I just checked DFTMC and the song is credited with background vocals by Florence and Mary, so I guess that's that. It definitely sounds like Flo but I'm having a hard time deciphering Mary. Anyway it's a noteworthy cut in the Supremes history for it's obscurity and no Diana.