If that opened My Documents in folder view then it's correct location for My Music folder.What I did was type "%userprofile%\my documents" into the "My Computer" address bar.
Could you grab a screenshot of this (you may save it as a .png file via Windows own MS Paint for example), please?Why I think I misunderstood is when I navigate to HKEY_USERS\S-1-5-21-2451687304-371562479-257786285-1005\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders
all that is there is a folder called "New", there is no My Pictures, My Music or My Videos folders to delete.