Great music tracks in different difficulty levels

If you like music like River Flows In You, or Fly (Intouchables) comes here fully at its expense. The difficulty varies in the central region, so that even with my daughter 10 years may already one or the other piece of exercise (with minor adjustments).
However, a drawback is the cover of the booklet. It is very stiff and over time the individual leaves solve out. For the choice of music I would forgive almost 5 star, but with the cover it then but only. 4