I just tested this so it does indeed work
sudo chown -R bti Sound
Are you sure that your username is Martin and not martin? Capitals are uncommon in Unixy user names. The -R makes it recursive so the command effects that directory and all others beneath it.
The icon won't update until you click it or log out and log in again.
EDIT: It might sound silly, but are you sure you're in the right directory? If you weren't it would obviously tell you that it can't find the directory. Perhaps you should specify the whole path just to be sure. Something like
/home/martin/Music/Sound
or whatever it is in your case.
Pro tip: If you try to run
sudo rm -r ~/.Trash/*
it won't do anything since ~/ to root is root's home directory and root's trash can. Root probably doesn't have any trash.
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