Summer has settled in, making it the perfect time to shutter your windows and stay indoors. So, while you’re inside spinning your favorite metal LPs, why not take the time to brush up on some heavy metal history? From now until Sunday at 11:59 PM EST, all books in the Decibel store are 20%. Take in the second installment of the Decibel Hall of Fame Anthology. including features on such bands as Motörhead, Slayer, Megadeth, Celtic Frost and many more, dig deep into the black metal underground with Black Metal: The Cult Never Dies Vol. I, experience real and not-so-true experiences with Judas Priest in Metal Gods: A Tribute to Judas Priest, or pick up one of the many other titles, including Murder in the Front Row, Swedish Death Metal, Only Death is Real, currently in stock as sweet discount. We promise that they have plenty of pictures.