Hi,
Several years ago I collaborated with a friend on two songs, where we incorporated a couple of my instrumental tracks into the songs, together with his vocals and other elements. I had sent these instrumental tracks to publishers before our collaboration. He then registered the new songs with SACEM in France.
Now he’s having issues with these two songs: one of them is triggering a Youtube Content ID notification (my instrumental was entered into the Content ID system by Indie Tracks); and the other is being rejected by Apple (my instrumental was added to Apple music by Audiosparx).
What would be the best way to resolve this?