/// <summary>
/// </summary>
/// <param name="key"></param>
/// <returns></returns>
public static Key GetParalel(Key key)
{
var note = key.IsMoll() ? (int)key.SubDominant : (int)key.Note - 3;
var paralelTone = key.IsMoll() ? Tone.Dur : Tone.Moll;
return(new Key(NoteFactory.Create(note), paralelTone));
}
public static Key GetPrev(Key key)
{
const int prevNoteOffset = -7;
var nextNoteVal = (int)key.Note;
nextNoteVal += prevNoteOffset;
var nextNote = NoteFactory.Create(nextNoteVal);
return(new Key(nextNote, key.Tone));
}