Developed in association with acclaimed guitarist and tutor Simon Nelson. 8Strummer is: A rhythm guitar primer, A vital resource for practising and improving rhythm guitar skills, A useful songwriting tool. Strumming in 8ths is: 4 down-strums on the numbered beats. 4 up-strums on the 'ands': 1 & 2 & 3 & 4 & = down, up, down, up, down, up, down, up.