Apple today seeded the fourth beta of iOS 9 to developers for testing purposes, nearly two weeks after releasing the third beta and more than a month after unveiling the new operating system at the 2015 Worldwide Developers Conference.

The update, build 13A4305g, is available through Apple's over-the-air updating system on iOS devices and is also available for download through the Apple Developer Center. Xcode 7 beta 4 is also available.

Today's beta includes the return of Home Sharing for Music, which was removed in iOS 8.4. iTunes chief Eddy Cue said Apple was working to re-add the feature in iOS 9, and he's kept his promise. This is also the first iOS 9 beta that's available for Apple's new iPod touch. For a full list of changes, make sure to check out our iOS 9 beta 4 tidbits post.

iOS 9 beta 3, which preceded beta 4, brought several much-desired features to iOS 9 including the News app, an updated Music app with support for the Apple Music service and Beats 1 radio station, folders for selfies and screenshots, 4x4 app layouts for folders on the iPad, and more.

iOS 9 is Apple's latest operating system, focusing on intelligence and proactivity with much improved Siri and Search functions, plus improvements to several apps like Notes, Maps, and Mail. iOS 9 also brings several highly desired features like split-screen multitasking for the iPad and performance boosts that improve battery life and optimize storage space.

As of early July, iOS 9 is available to both developers and public beta testers. The software will be released to the public this fall after testing is complete.