Import Error

I attempted to import a large group of music into iTunes this morning, adding an additional 10,000 songs to my library. I left after it had started because I had to get to work. When i got home, there was an error about not being able to copy them over, and when I clicked ok, there wasn't another message. It seems to have copied and added a bunch of the songs, but is there any easy way I could determine at what point it failed? Is there a log file anywhere that might tell me?