After you finish the double encore the bonus song will unlock. You can totally screw up the double and still get it. So, if you got a double you probably unlocked one of the songs.
Originally Posted by cosmic193
I just did 2 double encores now and they were both songs that were already unlocked, this time the encore was angela and the double encore was chimney.
Originally Posted by SeattleSauve
Sorry, its early morning (been playing rocksmith all night) and I misread your message. It is there and I am so glad you posted that or I would have gone crazy