I'm writing a research paper about the evolving role of the bassist in a band or orchestra, from the orchestras where double basses played cello lines, and from there, to the point where basslines started to do their own thing, to rockabilly, then getting into the electric bass, with James Jamerson, to Jaco ripping out frets and composing and playing like a lead player, to Flea and all the Flea wanna-be's out there, to Billy Sheehan's massive solos... I may decide to cut down to the past fifty years, basically from Jamerson to Jaco to Flea and everything in between. The paper needs to be 2-3 pages long, but I need to prove something, I was thinking along the lines that cheaper labor and technology has helped the bassist's role to evolve, allowing more instrumentalists than ever to stretch boundaries of a typical role. Any thoughts, sources, etc. that could help me out?