The guitar is one of the best-loved instruments of all time, but few people ever learn how to play it. The reason is often the difficult chord fingering with the left hand. This is why Udo Zilkens has developed the internationally patented JelGi method. It uses a C-major tuning and makes song accompaniment child's play. Within minutes a wide range of songs can be accompanied by old and young from the age of 2 years and above.