drewfx1
It's not a matter of "simple" verses "lead"; it's a matter of where things sit in the big picture. A bass guitar is not the same as a guitar an octave lower and vise versa; it's a different instrument.
That's one of my issues that makes a lot of rock music fall down the scale so far for me ... the bass is nothing but a support to keep something else going, and in essence, that is a very basic, and high school'ish music design for folks that are learning music instead of playing it and within a professional context -- which pre-supposes the bigenning stuff!
You can look at a staff for ... Tosca, let's say ... with its 30 or so instruments and different things ... and that bass is not an octave lower, and neither is that violin an octave higher, or that simple ... 4 different violins are doing 4 different things, and I'm not sure that a rock'n'roller, can think outside the box and into a more diverse universe!
Thus, what is "progressive" music, is the one that goes away from the simplistic and "beginner" level in musice to an area that spreads the ability of the instrument and the player.
The only thing that a score/staff can't do or represent well, is the "attitude" and some of the vocals that the 20th century taught us ... how do you put in words on a score "sarcasm with challenge" (Jim with Light My Fire) as a nice example, or "poetic and dreamy expressive" (Jim in When the music is over turn out the lights) in a way that even opera never did or could ... and even the great MEN singers of the 20th century did not improve the norm or standard (in classical music), whereas the women saw a vastly improved standard by the women (Callas, Tebaldi, Nielsen) who challenged the status quo in opera singing, and made it even better. In the case of the women, it was more individuality than it was anything else ... and that goes well with what became the main thrust in rock music right after.
I doubt I will ever get good enough to play bass with a high school band ... I have no delusions over that whatsoever ... but the history of the rest, is not about me ... and it is highly visible ... if anyone wants to put their glasses to it. Thus, again, hearing that one instrument ahs to support the other, is simply stated, very basic and high schoolish music learning and not what the "GREAT" groups ever did ... which was to improve and change the "basic" design and concept of things! We just don't seem to "get" that part!