Variable camera angles a a bonus (and why).*

http://www.chonday.com/Videos/pianodifrentway1


* Those not inclined to buy N GoPros can do much the same with eg old Canon
A series cameras - or many other older cameras with goo-enough video.
Canon A series have the advantage of being able to run CHDK software which
allows them to do essentially anything they can conceivably do.
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