Two is plenty!
People I write in praise of the two piece combo (no not the one from KFC). Two of my very favorite new groups are duos; No Age and F***k Buttons and appreciating them made me reflect on other great duos.
I really like the Black Keys and the White Stripes for midwestern whiteboy blues, and going back just a bit further in time Quasi and the Spinanes are big two piece favorites as well.
So if you are a guitarist or keyboardist and are thinking about starting a band, just get ye a drummer and you're good to go!
Here are links to videos by:
Quasi and the
Any other duos that y'all really like?