[quote name='Prime_BASS' timestamp='1339139215' post='1684125']
I can see a load of responses saying 'feel' and all that, but even with 'feel' how do I really know what is right for a song, and what isn't?
[/quote]
There is only Feel & Theory, and varying degrees of mixing both,
Perhaps de construct some basslines you like to see what they have done over each chord/bar, changes, repeats, variations etc