Blue Oyster Cult's Joe Bouchard, especially on the first three studio pre-'Reaper' albums(the only ones I really liked), always sneaking in great little fills, and got the spotlight occasionally---check out the breakdown at 1:40 on this one...
And this proto-speed metal cut, the run at 3:03 was always a favorite of mine...
There's so many great moments of Fernando Saunders on fretless with Lou Reed, but his fierce riffing in the middle of all the maelstrom of this track(the chorus particularly)stands out for me...
While Macca, Entwistle, and to a lesser extent Chas Chandler get name-checked in the British Invasion era 'advancing the state of bass' thing, Paul Samwell-Smith often gets forgotten about. Although, yes, he did a lot of root and five stuff, he provided plenty of runs that foreshadowed what Jack Bruce and JPJ did later. Check out the bridge on this...
'Shapes Of Things' as well.