Jeff Berlin (at times AKA Champion of Controversy, or Hero of Hypocrisy) has some interesting things to say about Jaco.
I tend to agree with many of Jeff's points, but his method in getting things across sometimes repels people.
He's right about one thing: Who "defined" the fretless bass sound and bass harmonics sound to all of us.

bassplayer.tv ; choose Berlin/Bailey Debate ; choose part 3/4