У вашего броузера проблема в совместимости с HTML5
Learn how to play Believer by Imagine Dragons on the viola.
The video plays in the original speed first then a slower speed.
This video is a visual animation lesson, tutorial or how to that uses number to represent the fingers used on each string. L stands for lower, for example: L1 means between 0 and 1.
The chart on the right displays the notes currently being pressed and which finger position is being used.