start with riff 1 then guitar 1 play riff:2a - guitar 2 riff:2b riff:2c is a bridge played by guitar 1 before riff:3a then guitar 1 play riff:3a - guitar 2 riff:3b
start with riff 1then guitar 1 play riff:2a - guitar 2 riff:2briff:2c is a bridge played by guitar 1 before riff:3athen guitar 1 play riff:3a - guitar 2 riff:3b