Claude says:Metallica's second album, banged out in three weeks at Sweet Silence Studios in Copenhagen with producer Flemming Rasmussen, marked a leap beyond the pure speed of Kill 'Em All — Cliff Burton brought music theory into the fold, and the band folded in acoustic guitars, longer instrumentals, and heavier songwriting ambition. You gave it a shot in late 2022, nearly four decades after release, but it never stuck. "For Whom the Bell Tolls" got the most attention, but two plays total says this classic thrash landmark didn't land.