With the Apple Music service launch there were iOS and iTunes updates. The new iTunes version is 18.104.22.168 and it comes with a new icon:
As with anything Apple releases lately, there are many reports from users having problems with the new Apple Music integration and issues/bugs in this iTunes release. Even more worrying, a mess between iTunes Match and the new iCloud Music Library.
The streaming side of Apple Music is great. But iCloud Music Library? I’m staying far, far away. http://t.co/VSKSlaTKLW
— Chris Welch (@chriswelch) July 1, 2015
There is also a Mashable article that highlights this problem. Please read it.
The most troublesome reports I’ve read are about iTunes messing with your music metadata like artist, album and other tags. Even removing things like “…XYZ remix” from song names.
I highly suggest making a backup of your iTunes library or music files before installing the new version, even more so if you want to try iCloud Music Library.