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I have a mixture of local music that I added myself to iTunes, along with albums added through Apple Music. Fortunately, iTunes recognizes this and allows me to “Remove Download” for the songs I added manually to iTunes. So all my songs effectively behave like Apple Music “songs.”
I'm wondering if there's a way to batch-remove all downloads from iTunes to free of some disk space, since I can stream non-downloaded songs anyway.
Plug her phone back into iTunes. In iTunes, click on her iphone, and in Options uncheck anything having to do with "Syncing Automatically". If it's not already checked, click "Manually manage music and videos".
If you want her to have a separate iTunes library, she should also have a separate login for the shared computer. This is really the easiest way to deal anything on a shared computer.
Incidentally, there shouldn't really be any reason to physically plug your iPhone into your computer anymore. You can actually set the phone (and iPads, etc) to sync wirelessly.
Assuming you're running the latest iOS (iOS6)
From the Home Screen, go to Settings > General > Usage
Wait while it loads your apps, then select music.
Then tap 'Edit' and delete your music.
Best Answer
In iTunes 12.6, under Music, select Songs and sort by
iCloud Status. If that column is missing, right-click the column headers and tickiCloud Status.Select all songs with a status of Apple Music by clicking the first one, holding ⇧ shift, and selecting the last one. Then right-click and select
Remove Download. Repeat for all songs with a status of Matched, Uploaded and Purchased.In fact you can simply select the first song with a status of Matched, hold ⇧ shift, then select the last song with a status of Uploaded. This is true in particular if you use iTunes Match rather than MUSIC.
The songs you want to leave on disk are marked as Duplicate and Ineligible.