Updating itunes music library
You can re-fresh individual files by playing them in i Tunes.If you have used an i Tunes will then re-add all the files you already have to you library. Rather, it will re-scan each file and will alter the metadata for the existing entries in your library.
This seemed to help i Tunes by breaking up the task into 27 smaller chunks.i Cloud Music Library is only available to Apple Music and i Tunes Match subscribers.If you no longer want this feature or any of the other features of these services, you can cancel or change your subscription at any time.I just updated my i Phone to i OS 5 and everything worked fine for more than a week.
However, all of a sudden, music started to disappear from my phone! What I also noticed was that when I clicked on Music once I connected my i Phone (like below), a lot of the songs were greyed out!If you can't connect to a Wi-Fi network on your i OS device, you can try using cellular data: If songs that you bought are missing or the song names appear in gray text, they might use digital rights management (DRM).