Updating my itunes library
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Typically if you manually manage music, you can add some music with a simple drag and drop song transfer that will not force syncing of everything in i Tunes.
But if the i OS devices music library has been pre filled through a recent sync or backup, it will try to autofill more stuff along with that action, regardless of whether you are manually managing music or not.
But you won't be able to play them on your other devices until you sign in to i Cloud Music Library in i Tunes.
Apple TV, Android, and some other devices access i Cloud Music Library as long as you're signed in on all of the devices with the same Apple ID that you use for Apple Music.
You said you searched for the library but you were not able to find it.
Your i Tunes library, a database that's made up of all of the music and other media that you add to i Tunes, is organized into two i Tunes library files and an i Tunes Media folder.
When you consolidate, copies of any files that were outside of your i Tunes Media folder are added to your i Tunes Media folder.
To save space on your hard drive, you might want to delete the original files after you make sure that the copies are in your i Tunes Media Folder.
You can restore your i Tunes library or i Tunes Media folder from your external drive to your computer.
On these devices, there is no option to turn i Cloud Music Library on or off.
Make sure that that you have the latest version of i OS on your i Phone, i Pad, or i Pod touch; mac OS and i Tunes on your computer; or the Apple Music app on your Android device.