Vhat yu'do is easy as 1-2-3:
Drag de music yu'vant into y'ur music fold'r.
Den, go to y'ur music notepad and type the names of de MP3 files (don't f'rget de tags b'fore and aft'r) and, if yu'vant to, remove de old music.
ALWAYS KEEP OLD FILES SOMEWHERE ELSE IF YOU NEED THEM.
And y'ur done! :3