Endless (ENDLESS) is an application that can be shared with friends and composed with SNS that can make sounds together. You can loop or share rhythms or melodies, and overlay analog sources. By looping through the beats made in the app, a friend from a distance can load their own voice and apply a delay-like effect to the updated sound source or load a rhythm.
Anyone with such an app can improvise participation when a link is sent, as well as analog acoustics and electronic instruments such as electric guitars. Anyone with rhythm and sense will become a professional level musician.
Of course, the target age is 4 years or older, so it is an intuitive structure for children. Related information can be found here .