Open the .src file
At the head of the file change these two lines:
[IndexUrl]=http://itunes.apple.com/search?term=%s&entity=album&limit=100&country=DE
[SearchBy]=%artist% %album%
into this:
[IndexUrl]=http://itunes.apple.com/search?term=%s&entity=song&limit=100&country=DE
[SearchBy]=%artist% %title%
Peronally, I would recomend discogs for this kind of research. It has a much better, more complete database. I tunes dates are not always correct from what I know, sometimes the have the date of the remastering or the digital release for old albums.