Suppose I am the drummer and want to play I can be your module.
I've done my Drupal install and mounted my laptop just above the hi-hat, and used drush to get this module up and running. I'm browsing to /ballad to see the song while I play.

Why on earth would I want to see the chords?
The text is fine, and the structure is fine, but the chords just take up valuable screen space.

There really should be some options for choosing which aspects of the song I want to see.