У вашего броузера проблема в совместимости с HTML5
http://www.masterguitaracademy.com a lesson for how to play a great sounding slash chord, C over G. A slash chord is a chord where the bass note is not the root of the chord. There are many options for slash chords. For example, C/F or G/B and so on. Think of it as the first letter is the chord (G) and the 2nd letter is the bass note (B). G over B, etc. Important Note: Slash chords have nothing to do with the guitarist from Guns n' Roses... :) I teach guitar at http://www.masterguitaracademy.com