Apple has just released iOS 8.4.1, a minor update that mostly fixes bugs with Apple Music and the revamped Music app included in iOS 8.4. It's available as an over-the-air update or through iTunes for any device running iOS 8, including the iPhone 4S, 5, 5C, 5S, 6, and 6 Plus; all iPads except the first-generation model; and the fifth- and sixth-generation iPod Touch.

Other bugs and security updates may be included in 8.4.1, but the release notes only mention Music-related things:

Resolves issues that could prevent turning on iCloud Music Library

Resolves an issue that hides added music because Apple Music was set to show offline music only

Provides a way to add songs to a new playlist if there aren't any playlists to choose from

Resolves an issue that may show different artwork for an album on other devices

Resolves several issues for artists while posting to Connect

Fixes an issue where tapping Love doesn't work as expected while listening to Beats 1

iOS 8.4.1 is probably one of the last updates we'll see for iOS 8—it looks like the final version of iOS 9 will be released next month following a few months of betas for developers and the public. The latest rumors say that Apple's next iPhone event will happen on September 9, and new versions of iOS are generally released around a week or so after that.

Update: And here's the list of security fixes.