The Google Play music store has kicked off ‘A Rock and a Hard Place’ promotion which offers rock and metal albums for as low as $3.99. There are a total of 90 discounted albums from the biggest classic rock and current metal groups: Guns N’ Roses, Aerosmith, Five Finger Death Punch, Black Sabbath, System of a Down, and more. No word from Google on how long the promo will last so if you see an album you like be sure to grab it soon.