A picture of Mungo Jerry on the same set exists dated 1973.
The date is wrong as Andi is there!
If 1972 it may be Ramsey Lewis - Wade In The Water from 04/05/72, the other MJ appearance on 20/04/72 shows no PP performance, but there are 2 crowd dancing entries! (David Cassidy - Could It Be Forever and Ringo Starr Back Off Boogaloo).
The outfits are probably wrong for Wade in the Water.
I think its safe to say doc that the top PIC isn't wade in the water as I remember someone once saying this routine was done using chiffon and waving it around as a jez guess ,back off boogaloo or possibly t Rex debra