Apple has released their third beta of iOS 8.4 to developers. They have also launched the second beta version for AppleSeed testers.
Developers can grab the latest beta of iOS 8.4 from Apple's iOS Developer Center. Additionally, developers, as well as AppleSeed testers, can download the new release over the air on a device running the previous beta. Developers can also get the latest release of the Xcode 6.4 beta.
The notable change in iOS 8.4 in the inclusion of a revamped Music app, which features a more streamlined version of iTunes Radio. iOS 8.4 is the second major update to iOS to expand testing beyond those with developer accounts. Apple's invite-only ApplSeed program began inviting users to test pre-release versions of iOS back in March.