This feature is long overdue in iTunes, but I am not holding my breath any longer for them to implement. I still will be using iTunes since I'll need it for iPhone and iPad as well as iTunes Match for them. But when I am using my iMac, I'd like to manage my music for effectively. I have a library with more than 10,000 songs, many of them are either cross-genre or hard to define so they require multiple genre tagging for me to effectively search & create genre-based playlists. Another big plus would be ability to tag multiple artists as separate fields instead of cramming them all into one field, which makes sorting bit annoying. Is there any music play on OS X that will do what I need?