A thought from another thread:
Of the 12 #1 hits the Supremes had in the 60's, do we know which were ever performed by the 70's Supremes?
I'd guess "Back/Arms" was never performed.
"Someday" was performed as a duet with Smoke on his TV show, but was it ever done live? Perhaps in the very 1st shows when it was still fresh off the charts? But maybe not?