In no particular order:
Louis Johnson (my personal favorite)
James Jamerson
Victor Wooten, Jaco Pastorius, Flea, (I despise their music but their skill is undeniable)
Stanley Clarke will get the Celine Dion treatment here - the music is simply too awful to warrant praise for the artist’s technical proficiency
Bootsy Collins
Larry Graham
Francis Rocco Prestia
Bernard Edwards
Thundercat

