For the aspiration for Musical Genius, there is a requirement to have songs licensed. When clicking on the mailbox to do so, it is not an option. There is also no other way to license songs.
Ideas
Yes, level 9 in one of the instrument skills to license songs for that skill. You can start writing them at level 8 and you'll usually finish your first song before you level up. You can only license one song at a time for each instrument. Once the first license expires, you can license another song for that instrument or you can just keep licensing the same song.