Not to get caught up in semantics or hair-splitting definitions, but I would consider Monty Python an ensemble, like Second City TV or Saturday Night Live.

When you think of comedy teams, a duo is usually what comes to mind or the Stooges and the Marx Bros.

All previous teams are great, but who could forget Burns and Allen, Stiller and Meara, Rowan and Martin, Allen and Rossi. Ed Sullivan always had one of those 'teams' on, but my heart belongs to the Stooges. I never missed them as a kid.