Any genre's fine
Maybe Queen - Another one bites the dust?
Chameleon has an easy bassline. Originally by Herbie Hancock http://www.youtube.com/watch?v=9SYDO3YE2AI
the ramones and the clash
Listen to a lot of classic rock - a ton of it has audible and tasty bass, while you really won't run into anything too complex.
Animal I Have Become by Three Days Grace ~ Easy and fun to play
Sweet child of mine is pretty fun on the fingers/