Mr and Mrs Peter Minelli...

I was fishing around YouTube again, and came
across this little gem.

In 1967 Peter Allen married Liza Minnelli. To
celebrate, Liza and the Allen Brothers played
an enormously successful season at the fabled
Chequers nightclub in Sydney - and made a
triumphant return to the boys' alma mater, TCN 9
Sydney, in a BANDSTAND special featuring
Liza, Peter and Chris.

Here's the finale trio number!

Cheers.