We want to advise iHomeServer users that in an attempt to rush out Apple Music, it looks like Apple didn't finish developing Home Sharing functionality for the new music app in iOS 8.4
As such, if you upgrade your iOS device to 8.4 you will lose the ability to stream music from your iHomeServer / iTunes server to your device.
This does not affect Apple TV or if you use iTunes to stream your music - these still work fine, and you can still stream your movies/television episodes to the Videos app on iOS 8.4.
For a workaround, you can use iHomeServer's web interface for iTunes which will let you navigate your iTunes library and stream media direct to your device.
Fortunately, it looks as if this is just a temporary thing, with Apple's Eddy Cue confirming that iTunes Home Sharing will be brought back to the Music app in iOS 9 which should be released in a few months time. We are counting the days!!!
See http://arstechnica.com/apple/2015/07/eddy-cue-apple-working-to-bring-back-itunes-home-sharing-for-ios-9/ for further information.