Even if you think your library has all your information consolidated already, it can't hurt to do a manual check before moving any data.
This process could take upwards of an hour or two, depending on how much data stored in your i Tunes library.
Perhaps more than one person uses your Mac, each with his or her own user account.
I’ve always been a music collector, and now I’m a professional DJ.
I do radio shows, sporting events, parties, parades, and yes, weddings.
Today I deleted my entire i Tunes library: music, playlists and all. The only real argument I’ve ever had with i Tunes is DRM.
In order to get record labels on board with the i Tunes Music Store, Apple agreed to develop and implement Fair Play, a proprietary system for controlling access to downloaded content.