For overall feel and enjoyment of his playing it's got to be John Paul Jones. For me, he's a huge part of what made Zep so amazing.
Can't believe I forgot Carole Kaye.Chris Squire
Donald "Duck" Dunn
Honourable mention would be Paul Webb (Talk Talk).
That's Tal Wilkenfield! I love her! Been a fan of hers for a couple of years!