Music Theory ADT

Notes

Note c = new Note(Note.C); // C middle octave
Note csharp = new Note(Note.Csharp); // C# middle octave
Note d = new Note(Note.D, 6); // D, 6th octave
Note fsharp = new Note(Note.Fsharp, 3); // F#, 3rd octave

Or using a string as a parameter:

Note d = new Note("D");
Note e = new Note("E3");
Note fsharp = new Note("f#");
Note eflat6 = new Note("Eb6");

Chords

Note c = new Note("C");
Chord cMajor = new Chord(c, ChordType.MAJOR); // C4 major
		
Note d = new Note(Note.D, 2);
Chord dAdd9 = new Chord(d, ChordType.MAJadd9); // D2 major with add9
		
Note eb7 = new Note("Eb7");
Chord ebAug = new Chord(eb7, ChordType.AUG); // Eb7 augmented

With inversions:

// C major, root inversion (bass = C)
Note c = new Note("C");
Chord cMajor = new Chord(c, ChordType.MAJOR, 0);
	
// D major add9, second inversion (bass = A)	
Note d = new Note(Note.D, 2);
Chord dAdd9 = new Chord(d, ChordType.MAJadd9, 2);
	
// F minor, first inversion (bass = Ab)
Note f7 = new Note("F7");
Chord fMin = new Chord(f7, ChordType.MINOR, 1);

Chord progression

Note f = new Note("F");
ChordProgression basic = new ChordProgression(f, "I IIm IV V I");
// Chord sequence is:
// F major
// G minor
// Bb major
// C major
// F major

Note c = new Note("C");
ChordProgression basic2 = new ChordProgression(c, "I V/1 VIm V I");
// C major
// G major (bass = B)
// A minor
// G major
// C major

Chord progression notation ("Agnostic notation")

All roman numbers mean major or perfect interval:

Roman	Interval
I	Unison
II	Major second
III	Major third
IV	Perfect fourth
V	Perfect fifth
VI	Major sixth
VII	Major seventh

Also, all roman numbers mean major chords:

If the root note is C, then
I = C major
VI = A major
VII = B major
and so on...

If you want to generate all the diatonic chords in the C major scale, then you must do:

I IIm IIIm IV V VIm VIIdim

Or in case you want the minor scale:

Im IIdim IIIb IVm Vm VIb VIIb

The b and # modifiers can be used on any roman number, even I.

That's why I named this notation agnostic notation. It doesn't know about scales or anything.

In the future, new notations can be added, and they could translate to this agnostic notation, for example, something more intelligent like:

Minor key: I VI VII

Translate to:

Im VIb VIIb

Which is the equivalent using agnostic notation.