This is the German release of the Miracle Piano Teaching System, sharing similar gameplay and educational focus as the other regional versions. The game almost certainly uses interactive lessons, teaching musical notations, and hand positions for playing piano. The German version would have adapted the educational content and instructions to reflect the local language and cultural context.  Without further information, the original developer is unknown, but the release in multiple regions suggests it had wide distribution.

Miracle Piano Teaching System, The (Germany)

Minna no Taabou no Nakayoshi Daisakusen (Japan)