Apple on Monday seeded iOS 8.4 beta 2, which includes a redesigned Music app experience from the previous beta, to its registered iPhone, iPod touch and iPad developers.
The software carries a build number of 12H4086d and can be applied over-the-air through the Software Update mechanism available in Settings > General, for those who are running the first beta. A standalone installer is available through Apple's portal for developers.
Release notes accompanying the download mention claim “this beta version of iOS contains bug fixes and improvements”. At least one new feature was spotted in this release: trending searches. Now when you're searching for a song on iTunes Radio via the Music app in iOS 8.4 beta 2, it will automatically suggest a list of trending searches.