From 2 to 17 different notes in Bass Clef, 32 free music reading lessons in alphabetical notation system (A B C...), 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. The color note option makes learning new notes even easier. It is also fully compatible with the "Learning" menu of the computer game "Happy Note! Treble and Bass Clef".