Lars K. Norberg (Spiral Architect) - relatively unknown due to the nature of the music (metal that usually only appeals to musicians that like to try and dissect everything that goes on in a song, extremely complex), but what he does is simply phenomonal. All bassists should give their album a listen at least once just to see what's being done, even if it does go completely over their head.
Michael Manring - does some fantastic solo work on fretless and piccolo basses, look him up on youtube.
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