Restore System Icons
Hi!
This seems to work. Create a new temporary user account with admin privs. Maybe call it 'temp'. Login to temp and you'll see the default system icons in Finder. Go to the Shared folder (BootDiskVolume/Users/Shared) and create four new empty folders for Music, Movies, Documents and Pictures. Go back to temp's home folder and GetInfo on the Music folder. Highlight the small Music icon at the top left of the GetInfo window (treble clef), and click Edit/Copy. Go to the Shared folder, GetInfo on the empty Music folder, highlight the generic icon at the top left, and click Edit/Paste. The treble clef icon should appear.
Repeat this for all of the four empty folders in the Shared folder.
Now log back in as yourself. Go to the Shared folder and GetInfo on the empty Music folder. Highlight the treble clef and Edit/Copy. Now go to your home folder and GetInfo the Music folder. Highlight the generic icon in the top left and Edit/Paste. The treble clef icon should appear.
Repeat for all four system folders.
To get them into your sidebar, drag the old custom sidebar icons out, and drag the new ones in.
I hope this works for you! It drove me nuts for a while.
John