Zakk Sabbath, the Black Sabbath tribute project featuring Zakk Wylde (Black Label Society, Ozzy Osbourne, Pantera), Rob “Blasko” Nicholson (Rob Zombie, Ozzy Osbourne), and Joey Castillo (Circle Jerks, ex-Queens Of The Stone Age), have released a new “Greatest Riffs” compilation. Fans can find that effort on the service of their choice HERE. “Greatest Riffs” Track…