And don't forget about FACLs, recently introduced into linux. You just do something like
setfacl -rm user:eric:rwx /mp3;
and user eric gets full access to /mp3 regardless of the user-group-all permissions. You'll need a new distro with a modern kernel, and maybe a package about facls to get setfacl and getfacl.
-Eric Hattemer

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