I think The Blues and Country & Western are two genres in which the bass should just stay in the background and play support. If I try to imagine a bass solo, it just doesn't seem to fit in my mind.
Even in Jazz, when Stanley Clarke and David Bromberg go berzerk they lose me.
Or try to imagine someone slappin like Marcus Miller on Hank Williams', "Your Cheatin' Heart."
Some things just don't fit, know what I mean?
Just my view.
Mike