У вашего броузера проблема в совместимости с HTML5
Sometimes, you just want to learn a song but you don't play the piano...say good-bye to that problem! I've created a strip of LEDs that fits nicely atop a standard piano keyboard and is programmable (using an Arduino Uno) to play any song you like at any tempo you need. Check out the full step-by-step at instructables.com/member/tcone