My Version of "Re:Zero S2 OP 2 Long Shot" played with the Virtual Piano and the Ingame Windsong Lyre. I make every track by myself sometimes with support and inspiration of others. Using "Online Sequencer" i theorycraft a Midi file and refine it with a freeware "Midi Editor"
I do my best to create a close enough experience to the Original Soundtrack while adding my own charm. The final file can be converted to a sheet and played like a simple rythm game with "Virtual Piano" however you do need your own tact or help of other kind if you want a fullfilling experience using all the above mentioned Programms.
The Windsong Lyre in Genshin Impact has a low amount of key inputs, im only working with low C3 to high B5. Online Sequencer uses the same 15 keys which allows for "fast" (stil hours) progress.
I played the Bard Performance Tool from FF14 for close to a Year which is really similar to this (just with about double the keys compared to Genshin) and will move my songs alongside the FF14 ones unto my channel.