1)   Happy Note! Sing 'n Learn Treble Clef and Bass Clef 1.30 From 2 to 17 different notes in Treble Clef and Bass Clef, 64 Readings to learn at your own pace. Hear and sing (or read) the notes at the same time! Each lesson features 5 different tempos: Largo - Adagio - Andante - Moderato - Allegro.