I have cleared all my music from my iPhone. I have "Sync music" unchecked on iTunes, but some songs are still on "on this phone" in itunes, how to clear it from itunes "on this phone" ?

Question

iOS 8.0
I have "Sync music" unchecked on iTunes and I have cleared all my music from my iPhone.
On my Mac, on itunes (version 11.4) if you click on "on this phone", there are still remaining 70 songs...
how to clear it from itunes "on this phone" ?

Answer 1

What you have on your computer is your iTunes library, not an iTunes "account."  The account that is related to iTunes is your Apple ID, which you use to sign in to the iTunes Store and make purchases.  It is also used with iCloud.  iPods (that are not iPod touch) are associated with your iTunes library, not to your Apple ID.
So, I think you probably just need to set up (or update) automatic syncing for the iPod.  If it's not set up to sync those new songs, iTunes still syncs the iPod, but it syncs nothing
In iTunes, if the sidebar (along left side of iTunes window) is hidden, from the menu bar, under View, select Show Sidebar.  In the sidebar, the iPod appears under DEVICES, when it is connected.
Select the iPod in iTunes.  There is a row of buttons, starting with Summary.  Click on Music next to Summary.  This is the iPod's Music screen, where you tell iTunes how to sync songs to the iPod.
Check the box for Sync Music (if it's not already checked).  If your iTunes music library fits completely on the iPod, you can choose to sync Entire music library.  Otherwise, you can choose to sync Selected playlists, artists, albums, and genres.  On the lists below, checkmark the playlists, artists, albums, and/or genres that you want on the iPod.  When you click Apply, the songs from your selection sync to the iPod.
One convenient way to set this up (if you can't sync the entire iTunes music library) is to create a new playlist in your iTunes library.  Name it "iPod Songs" (or whatever you want).  Put ALL songs that you want on the iPod on this playlist, including those new songs.  Back on the iPod's Music screen in iTunes, select this playlist under Playlists.  Going forward, to update songs on the iPod, just update that playlist in your iTunes library (add/remove songs).  The next time you connect the iPod (or click the Sync button), iTunes automatically syncs the same changes to the iPod.