live from sidney (portrait)

A couple of days ago I posted the following inquiry:

There is a portrait of someone on MacPhisto's dressing room wall. Does
anyone know who it is?

I received the following answers:

Caruso (Opera Singer)
Caruso (Opera Singer)
Mario Lanzo (Opera Singer)
Mohammed Ali (Boxer)

While I don't know anything about Opera, I do know a bit about boxing. I
KNOW that the portrait is not Mohammed Ali. I don't know, however, which
opera singer it is. Someone (I think it was Robbie) mentioned Caruso is
on one of Gavin Friday's album covers or something like that. Anyway,
does anyone have any authoritative information on who the portrait is? I
tend to think it is Caruso, but for all I know Caruso and Mario Lanzo
could be one and the same.

thanks,

David