What exactly is the purpose of that? Xiaomi.eu rom already has music app and the services that are only availabe in china are taken out. I think you can just download China dev rom and take the apk file from the .zip and install on your phone.
What is purpose of installing original music.apk?
Tried deleting music.apk from system files with rootexplorer and replacing with one from china dev rom? I don't think they blocked it.