vancouver and I have been working on a suite of music apps for young kids, all written in Construct2. Platforms range from Web to iOS to Windows 10/phone.
Pre Piano Lessons
A visual learning system which associates animals with notes. Children compose a melody, play it back, and print out their "score" as both a certificate and a coloring sheet.
Creative Children Compose Music
A learning tool for teaching composition much earlier that conventional music techniques. The main tool for a timed course which includes videos, mentoring, and a printed certificate of completion.