I too have edited song styles for certain songs, changing voices, drum sets, etc. ... There is a ballad style on my KORG Pa900 that the Intro and Ending 1 is perfect for "Unchained Melody", but when I use that same style for any other song, I use Intro 2 and give my own intro ... Other than that, I fall in with what mirza and Don said about 'specific' styles ...

I can think of only 5 midi files that I use regularly: the Bobby Darin version of "Mack The Knife" (edited to add a 1 chorus piano solo); "New York New York"; "Sweet Caroline"; Van Morrison's "Moondance", and "My Girl" ... I have others but seldom if ever use them ...