Stevie Wonder - The Beat Club (1973) [mp3] [mpg]

Stevie Wonder 1973 concert on German TV show Musikladen/Beat Club.

One of the ladies, Afro and a polo shirt, singing backing vocals is Denice Williams.
She was part of Wonder's female background singing group Wonderlove.
I think this is the partial lineup, based on what Stevie says at 23.15:
Reggie McBride plays bass. Michael "Mike" Sembello on guitar and keys, Ollie E. Brown on drums.

Song list:
1. Jam
2. Contusion
3. Higher Ground
4. Don't You Worry 'Bout A Thing
5. I Can See The Sun In Late December
6. He's Misstra Know-It-All
7. Living For The City
8. Superstition