First working version
Support octaves in Keyboard
Display chords starting from the right note
Refactoring
Add Note class
Add comparator method for Note
Chord class
Replace Chords static class with Chord
Add minor scale to Scales
Add ruby version file to gitignore
Basic README
What's in a name?
Basic Scale class
Add Scale#matches? method
Add Chord#== method
Make Chord inspection more readable
Add Scale#chords method

The method returns the chords in a scale.
Remove octave from Note#to_s
Add minor chords for a Scale
DRY up .irbrc file