I agree with all the sentiments regarding John Paul Jones, a superb musician both technically and aesthetically.
In a similar vein, I'd argue the same role was adopted by Geezer Butler in Black Sabbath, Jack Bruce in Cream and John Entwistle in The Who. All very proficient and highly accomplished bassists who knew just what to play to complement the sound.
When you think about it, these four guys (and others of course - Lemmy anyone?) had to perform double duty in the rhythm section - especially live - as each band only had one 'permanent' guitarist. You notice in a lot of Sabbath songs that when Tony Iommi is taking a solo, Geezer actually plays a more 'simple' bass part to anchor down the rhythm and leave room for the lead work.