Bassists don't tend to "change" music in the same way guitarists do. They are more noted within their own niche, or perhaps as part of a bassist / vocalist package (Bruce, McCartney, etc). A guitarist's influence is usually more palpable, but even there the player must cast an unusually large shadow. It requires that the player inspires non-musicians as well as those who play. The Beatles did it as a band. I can only think of a few in my lifetime - Hendrix, Van Halen, SRV - possibly Clapton. Chuck Berry, maybe, as well, but that is a little before my era.
I agree with Gary's earlier comment re Jamerson, but his influence was rendered almost anonymous (for many years) by virtue of his role as a session guy. IMHO, of course.