Musical Ear Prismatic siluetti 11 months 3 Musical Ear Type II Prismatic siluetti 11 months 0 Music siluetti about 1 year 3 Music siluetti about 1 year 3 Treble clef siluetti about 1 year 3 Clef siluetti about 1 year 1 Clef siluetti about 1 year 1 Clef siluetti about 1 year 2 Clef siluetti about 1 year 1