Par NG YING YING / O'SULLIVAN FARRELL MARGARET. Book 3 introduces the concepts of key, key signature, scales, triads, tones and semitones in a novel and exciting way: each key is a group of characters or objects with note-names (i.e. a band, a birthday party, a clothes-line with garments). Certain notes belong, while all other notes (accidentals) are outsiders. Transposition is a natural outcome o…