Roundabout

Eventually you'll find basslines you love in songs you, well, don't like that much. Roundabout, by Yes, is such case for me.
Chris Squire is amazing on this one, though.

Song: Roundabout
Artist / Band: Yes
Album: Fragile
Bass: Chris Squire
Year: 1971

Bass tab (external link)

Money

This song (mostly) in 7/4, written by Roger Waters, was one of the first pieces I've learned how to play on the bass. I really enjoy how Water's bassline makes the exotic time signature sound very natural.

Song:Money
Artist / Band: Pink Floyd
Album:Dark Side Of The Moon
Bass: Roger Waters
Year: 1973

Bass tab (external link)

Lady Fantasy

I was never a Progressive Rock fan, but I must admit that there are a few songs (and even bands) that I like. A friend introduced me to Camel, and I really enjoyed the bass from this track from their album, Mirage. The best part, for me at least, is the riff that starts around 9:10. 9:10!!!

Song: Lady Fantasy
Artist / Band: Camel
Album:Mirage
Bass: Doug Ferguson
Year: 1974