Now, about the sidebar. If you've been using iTunes for awhile you're used to seeing a sidebar. It's not entirely gone, but it too is now contextual. To view it, you must select one of the Playlists entires. When I do that while viewing Music, the sidebar appears along with my playlists.
Within this view I can then change how my media appears from the menu on the right. If I want to see all the tracks in my music library, for example, I just choose Songs. Likewise, I can switch to my movie library and then view a movie list. Same idea with TV shows. One nice thing about this is that the view is sticky. When I move between media types, the last view is maintained.
Yes, iTunes 12 is a big change and not everyone is going to like those changes. That said, once you know how to navigate through the interface, those changes aren't nearly so hard to swallow.
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