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iTunes 12.4 Update to Feature Minor Redesign With New Sidebar, Improved Navigation
A redesigned dropdown media picker will be used to switch between Music, TV Shows, Movies, and other content, replacing the existing navigation icons. Like the current menu, the new menu is customizable, so sections of iTunes that are not used can be hidden from view. Forward and back buttons can be used to navigate between different sections.
A persistent sidebar located on the left side of the app is being added, which will make it easier to access different portions of an iTunes Library like specific songs or albums. The sidebar, like the menu bar, can be edited to show desired content, and songs can be dragged and dropped to playlists.
Menus in iTunes 12.4 are being simplified to make them easier to use, and the available content in Library can be customized using the redesigned View menu. Menus will be "easier to use" updated with new navigation options.
The mini player will also get some slight design changes, with the Up Next song feature being relocated to the right side of the player where it is more clearly visible.
It is not clear when Apple will debut iTunes 12.4, but our source says it should be released within in the next few weeks, putting a launch date in late May or early June.
Rumors have suggested Apple is also planning to introduce significant changes to Apple Music in the iOS Music app in iOS 10, and additional tweaks could be made to iTunes in OS X 10.12 to mirror changes being introduced in iOS 10.