Transferring your iTunes library along with your playlists and ratings isn’t just a matter of moving the music files. Sure, the song-specific metadata like artist and album will be copied over in the files, but the data YOU assigned, the playlists and ratings? Those live inside iTunes’ internal database files which can’t be simply copied from PC to Mac.
Moving your song ratings and playlists from a PC to Mac isn’t impossible, but it takes a little elbow grease. Here’s how to get the job done : Gina Tripani @ Lifehacker