iTunes 12 got some changes this time around too. Unfortunately, it looks like we’re all stuck with the new interface and can’t bring back the old sidebar, but you can at least get the list view back. When you’re on the “My Music” tab, click the drop down on the right and change it to “Songs.” This’ll sort everything in the classic list format. You can also click the “Playlists” tab to get part of the sidebar back, although it doesn’t include all the same info as it used to.