Sounds like you just want a symlink (man ln).
Go to the directory where you want to link FROM, then do this:
ln -s /path/to/link linkname
If you have a directory /home/myuser/Music and you want that to also appear in a Media directory in your home directory, do this:
ln -s /home/myuser/Music . (Note the dot, this will name the link Music)
ln -s /home/myuser/Music MyMusic (Gives the link a different name - MyMusic)