The project is based on mature technology, with years of experience. A version of Anthem already exists. I wrote it. However, this original version is proprietary and closed source. It runs on the Acorn RISC OS platform.
Experience is key - the main problems have already been identified and solved once.
The ride is a lot smoother this time around. MIDI playback framework underneath. It doesn't fit. The program will never get off the ground. But you may end up with a nice looking set of windows.