If you’re interested in band logos and how they were designed then there’s a cool site dedicated to logos and brands. It features a fair bit on AC/DC and Led Zeppelin, but has just posted a feature on Black Sabbath’s first 8 albums, including the four Vertigo Swirls as well as Sabbath Bloody Sabbath, Sabotage, Technical Ecstasy and Never Say Die. Click here to go to WhatsThatFont…