I think that the three top bass lines ever are:
Born Under a Bad Sign (Jimi Hendrix)
Echoes (Pink Floyd) (the 'ding tinga...ti ding ding tinga' part)
Heard it through the Grapevine (Creedence Clearwater Revival) (the eleven minute cover of the Marvin Gaye song)
These are such artfully constructed bass pieces that they seem perfect for just any kind of guitar solo and obviously the sheer genius of the bands lay in providing just such a screeching, wailing solo.
I wonder if others will agree with me...