See the forums section about web sources scripts, e.g.
/t/9226/1
and see if there is something that you can use.
As I am sure that you could also use all the other information that the scripts supply, I would let them overwrite the already existing data.
(if your example with "Bruce Springsteen - No surrende" is accurate, then a little updating would do no harm as it should be "Bruce Springsteen - No surrender")
Like that you would save yourself from writing new scripts from scratch and you would also take over the jargon as used by discogs (which could be some kind of standard) so that you do not have to worry about the "featuring artist".