How to find songs in itunes that are associated with a different itunes account.

Every time I get a new phone I have to click over and over through a message saying "This iCloud backup includes purchases from a different iTunes account." Which includes everyone that ever emailed me a song back when that's how we shared music and now those sings are in my library... How do I search for these songs so I can delete them?

I read you can click on the info for each song and find which iTunes account it's associated with, but I've got 10,000+ songs.

I just want to get rid of the handful that are not associated with my account.

My iTunes library includes all my CD's I imported, and iTunes purchases over the years.