I'm actually posting this for my brother. He's been teaching music for over 15 years. Now with the social isolation he's finding the tools out there left much to be desired. He's looking to build a system that allows him to effectively switch between different instruments and note sheets, instructor, and whatever else is needed. Also allows the instructor to listen to multiple students at the same time. Many more features specific to music teaching. Maybe design with plug-ins so it can be applied to other niche?
He has success with a mobile app for music students before so his instinct is pretty spot on. He said there are many music instructors waiting for a system tailored to their needs and are willing to pay monthly subscription for different features.
Your contribution will be rewarded with share ownership and future revenues.
Looking forward to hear from you.