Originally Posted by ChaosDecides
Yeah some bands might need a more distorted bass sound if they only have one guitar player and want to have a more guitar sounding backing rhythm when the guitar player is playing a solo.
That makes sense, though one of the fun things about playing three piece is filling in during the solos.
King Crimson's Asbury Park
is an early example - just guitar, bass and drums. It's an insanely good jam: http://www.youtube.com/watch?v=SMYCQa5keaI