Apple today released iOS 8.4.1 to fix several bugs affecting Apple Music, but the update also breaks the TaiG iOS 8.4 jailbreak, according to the security notes. As you can see from the security update, Apple has patched several exploits used by the TaiG Jailbreak Team to release their iOS 8.4 jailbreak tool. iPad, iPhone and iPod touch users who want their devices to remain jailbroken should not upgrade to iOS 8.4.1.
Apple seeded the first iOS 8.4 beta to developers on Monday. The new release comes only a few days after iOS 8.3 was released to the public. The official release notes only mention Apple's "all-new" Music app, which has been redesigned to make "exploring your music collection easier and more fun," and iTunes Radio.
iOS 8.4 users will be able to personalize Playlists with their own descriptions and art, and recently added artists will now be displayed at the top of your library so they're easier to locate. Other new features include Global Search, an improved "Now Playing" section with "a stunning new design that showcases your album artwork," the ability to wirelessly stream music from the Now Playing window and a new MiniPlayer that allows you to see what track is playing while you browse your collection.