Bass is more than just a guitar with two fewer strings. It has a different tone, scale length, feel and musical role, and in many cases it requires a different conceptual and technical approach. Guitarists who are new to playing bass will often double the guitar part one octave lower. There is certainly a place for lockstep octave doubling - just listen to Aerosmith’s Sweet Emotion, Led Zeppelin’s The Ocean and Pantera’s I’m Broken. But there is so much more that can be done with the bass guitar.