Key music education has been autonomously developed on the basis of the music learning cognitive pattern of children aged 3-18, “keyboard king”, and has been awarded a national patent and is now highly recognized by oxford university. In recent years, double-trip keys have been admired by parents and children for having a rich voice that allows children to be exposed to a variety of musical features. Smart keys, which shape the perfect hand style, are no longer too heavy to affect the development of the child's double finger bones. At the same time, this instrument allows learners to use both their hands and their feet while working on the right and the right brain. The key is used in the teaching of double-trip keys in western classes to enable children to learn not only music but also to develop teamwork. In addition to this, the key develops learning methods both online and offline, so that extracurricular exercises do not become boring, so that interesting online tea...