Elis Regina & Milton Nascimento

I recently saw this video posted on confessiones nocturnae. Here's what's notable about it, in my opinion:

Elis Regina sits in an armchair the whole time.

Milton Nascimento is wearing a crazy-quilt dude hat and sings a mean high-pitched backup.

Elis Regina makes up for not moving her tush with intense facial expressions.

Brazilian Portuguese singing in the mid-'70s.

Nice drum set. Who is the man behind it?