I think you can figure that anything on a major label is copyright-limited, other than traditional stuff.

It sounds daunting to sort through all that, but then again maybe not. Most of us have repertoires of no more than a few hundred songs, and we pretty-much know the stories behind the songs. For the songs we don't know backgrounds for, it's not unreasonable to search the ASCAP, BMI, and Harry Fox Agency (Songfile.com) databases. Better that, than to try to find a comprehensive list of artists and composers.

-Joe-