Add the ability to have up to 4 notes per chord.
Add display for note octave.
Add separate homepage for searching and displaying chord data.
Add a default 'none' state for chord menus in case you want to choose less than 4 notes in your chord.
Add logic to chord form partial so that menus populate with previous note choices when you edit a chord.
Fix bug where updated notes within a chord are not being saved to the database.
Add params to note model for which instrument to play the note on, a string identifier for the note, and how loud to play the note.