The problem is, all my favorite bass players in rock, are in prog and its various subgenres, and a great many of them, are also jazz-fusion players. Or at least, have the chops to play at that level.
But I will list them anyway.
I will start with Chris Squire, and obvious choice for his playing.
Patrick Djivas from Italian prog band, PFM. He has also played jazz-fusion, so can hold his own with the best.
Alessandro Porreca from another Italian band, Deus Ex Machina. Again, he has fusion level chops, so this may be cheating?
Bernard Paganotti or Philippe Bussonnet are monster bassists for French prog band, Magma.
Péter Pejtsik from brilliant Hungarian chamber-prog band, After Crying, He plays cello, also.
Tom Hyatt from US prog band, Echolyn. Not a fusion player, but just a great prog-rock player.
Jon Camp is a somewhat forgotten bass player, but his playing with underrated prog band Rennaisance, is pretty strong. He plays it like a lead instrument.
Raymond Shulman from Gentle Giant has to be mentioned, not so much for his chops, but the intricate parts he had to play.
Greg Lake, John Wetton, Mike Rutherford, are also obvious choices, and good players in their own right.
