Music is a complicated roadmap of notes and rhythms. It is more compicated still when the map has been twisted around and hidden from sight.
To identify this song, find the path through these pages of music which passes through each page exactly once. At each page, record the number on the page and the letter of the chord marking the link used to exit that page. Once you have found the path, add the number from the last page onto the letter from the first page, the number from the second-to-last page onto the letter from the second page, etc.
In finding the answer, you may ignore the letters and numbers from the first and last page! (Boundary conditions, you know... since there isn't a "correct" link off of the last page.)
You may begin through here