I know SonicStage stores it's library details in an mdb Access database file. I don't know if it's locked or not, meaning it may not be possible to open it at will from outside of the application itself, if it is possible, one could open it with Access or any small application which was developed to open, read and query the database file.
I'll have a closer look at this later. It is possible someone has already done this and there may already be a tool out there for this purpose but if there is not, I need a good winter project! :-)