Ever since I picked up a bass to add some rumble to my tunes, I've been zoning in on bass more than I've ever thought I would. Listening to the radio in the car, this tune came on and I was impressed at just how busy this bass line is without being over the top:
Genesis No Reply At All (Official Music Video 1981) - YouTube
Then there's also tunes like this:
Living Colour - Ology / Fight The Fight - YouTube
...and this
Billy Sheehan Bass Solo! - YouTube