U mean like ringtones notifications? They r located. System/media/audio...... make the folder read n write find mp3 u like n paste it in that folder n done

I'am sorry you can also just use a root file manager and go to the music you like and press the menu button and choose save as Ringtone thats the fastest way... sorry I didn't add that in there as well.
Thank u sepero

 

Did this work for u kind sir thank u

 

But remember dont rename any of the folders in there cause then your phone will be like hua gets confused n every time it goes to that directory it will throw errors force close could happen.
I imaging u can add folders but becarefull along the way like try backing up everything first then apply 1 at a time so if it messes up u can recover from it n proceed I hope this works for ya if u need any more please feel free to ask n I can also help u in the boot animations as well means ur already would be in that folder media