Here’s how I did it 😊
I wanted to play around with Final Cut Pro‘s multiple cameras feature, but I only have one tripod and phone. So I recorded the tune five times in a row from various angles (you weren’t far off with your guess of six). All I had to do was stoically continue to play no matter what.
Then I used FCP to merge them into a single multicam track. Of course the sound was unacceptable with all the clashing mistakes, but I just muted it.
Then I went back to the piano and recorded the sound separately, in stages. Then I spliced all the good bits together in Audacity and added the final result to FCP.
The final step was playing the video with all those angles shown in a grid and clicking the one I wanted to show. Literally less than two minutes’ work, the time it took to play through.
It was quite an eye-opener how you can create something impressive so easily. If I can do that with just an hour of spare time and no editing experience to speak of, I can just imagine what a team of professional editors would be able to come up with…