I've just put my bass down after a play through of Keep On Running.
IMHO it's a great piece of music with a driving bassline featuring good syncopation and memorable riffs. Despite few 'blue' notes it manages to convey a great sense of movement.
Other great examples: Heard it on the Grapevine, Sunny Afternoon, Jean Genie... but even some superficially simple songs contain subtle little details.
It's not Beethoven, but it's way more complex than most modern 'pop' music. When waiting to go on, I often quietly play along to the DJ/Jukebox and you can crack many modern songs =very quickly. Why have the basslines of popular music become so basic (excuse the pun)?
Is it just that old-school bass players had a bit more theory knowledge? Or just that modern music is so dance oriented the bass has just become an extension of the kick drum?