Apple has released its second beta of iOS 8.4 to developers, a release that continues to focus on Apple’s new Music app introduced in the original iOS 8.4 beta. Featuring a build number of 12H4086d, the release is also accompanied by a new Xcode 6.4 beta to support the new APIs and development environment. The release notes for this latest beta indicate both improvements and limitations in App Extensions, CarPlay, App Store, iTunes Store, MFi…
