A few songs you could play that show off the bass a bit:
*
The Who - Quadrophenia (the bass has the lead for most of the song)
*
Level 42 has some truly excellent bass playing done by mark king but to play it you'll want to be pretty proficient at slap bass.
'Hot water', 'Love games' and
'43' have some good bass lines but if you really want to blow some one away then have a go at '
Mr Pink ' which is my personal favourite bass line. Here's the gist of the first riffs of Mr Pink
http://www.cdscout.co.uk/olliecollins/MrPink.htm
*
Jamiroquai, especially in their early stuff has some really good bass lines. It's a good mix of popo/funk/acid jazz. Have a listen to
'Travelling without moving' and
'High Times'. IMO their best bass track is
'Space Cowboy' which was played by Stuart Zender. Regardless of whether you learn it as a piece, learn space cowboy.
* Stevie Wonder - Sir Duke (play the band shout at the middle and the end)
* Rush, Geddy Lee created some pretty quality bass lines, check out stuff like the odd time signature section in 'Tom Sawyer'
* Earth, Wind and Fire have a lot of good pop-funk tracks, have a listen to 'Serpentine fire' and 'In the stone'.
* Michael Jackson - Rock with you (this is really good quality bass playing. This transcription is very good but it might be a step out of tune:
http://www.pnc.com.au/~beehive/rock.html )
* Rage Against The Machine - Bombtrack (Good punchy rock riffs, as per most of their songs)
I hope that gives you somethign to work with.