Bard Performance songs

So I just got the bard class unlocked and started performing with the songs. I'm really bad but its fun. I got like 5 songs unlocked and out of the 5 i prefer to play worlds apart with performance assistance with a controller and a image of the controller on the screen of which buttons i need to press. That being said the song worlds apart is just a small part of the full song and i wish to play the full song with performance assistance. Is there a way to unlock the full song and if not can I have an add-on / mod of sorts to get the full song with performance assist?