What is "rock-a-rolla"

Rock-A-Rolla is a music magazine covering experimental, avant-garde, noise and metal artists pushing the boundaries of music. Launched in late 2005, it is published bi-monthly in the UK by V-Squared Publishing Limited and distributed worldwide, mainly in UK, Canada, USA, Europe and Australia. In the past the magazine has championed such diverse artists as Khanate, Zu, The Locust, Justin Broadrick, Mike Patton, Melvins and others. The current editor-in-chief is Vuk Valcic.