"Many schools have moved classes online because of the COVID-19 pandemic. We hope that children can still have access to music learning while the school campus is shut," says Lei.

Keeping with the style of engaging children with fun games during their music learning, the app offers children animated lessons, such as games for ear-training, rhythm and interactive exercises.

Zu learned some animation by herself as the combination of music and animation is a highlight of the app. She designed the main character Dolala, an elf, and his seven playmates, symbolizing the music notes.

Lei and Lin mainly compile the contents of the courses.

"Music is one of the best ways you can keep your kids entertained. We want to use creative ways of keeping children informed and entertained at the same time," Zu says.

When they started to work on the app, Zu's 7-year-old daughter became her student. Her daughter didn't learn to play any musical instrument but started listening to music and learning about music theory by playing games.

"For kids, it's a pleasure to listen to soothing sounds and rhythmic harmonies. It's the first step of introducing them to music and having them intrigued before they learn any musical instrument," says Zu.

For now, they are working on more content for the app and plan to have more courses, such as music history and combining music with other art forms, such as theater and painting.