Note a single duplication of any song by the same artist but it is amazing how may artist do the same songs.
A little over 96.3GB in my iTunes library on the lappy (none of it legal --- that'd be $15,000+from the ITS!)
This is really hard to do, especially when you have an artist who releases numerous CDs and then a greatest hits CD and then is an artist on a compilation CD. I run into that problem a lot with my collection, but I refuse to delete tracks from whole CDs and have an "incomplete" collection. I'm retentive about that. I'm OCD when it comes to tagging, and have scoured AppleScript websites to find some that help me along. I love having a mac!