Musio is a music app designed for deaf people. When I was volunteering at the Disabled Children’s Welfare Home, I found that children have much more curious hearts for new things compared to adults. They try to get to know the world through all of their senses, seeing with their eyes and touching with their body. However, most kids in the Welfare Home are aurally impaired. They cannot hear people’s talking or music, and thus cannot feel the happiness brought by music like we can. This provoked me to design a music application for them. I target both aurally impaired and normal people from six years old to adult. In fact, many people with good hearing abilities don’t play musical instruments. They only listen to music, but cannot feel the joy of playing music by themselves. My application expresses music using visual language. Each music note is represented by a color, and the size of the symbols represents the rhythm. When music is played, the user can feel the rhythm by clicks following the changing symbols. The application also has a social function. I found that it is more difficult for disabled people to make friends, so I added this function wishing to help them meet their peers and connect.