Hard rock entered the 1990s as one of the dominant forms of commercial music. The multi-platinum releases of AC/DC's The Razors Edge (1990), Guns N' Roses' Use Your Illusion I and Use Your Illusion II (both in <answer>1991</answer>), Ozzy Osbourne's No More Tears (<answer>1991</answer>), and Van Halen's For Unlawful Carnal Knowledge (<answer>1991</answer>) showcased this popularity. Additionally, The Black Crowes released their debut album, Shake Your Money Maker (1990), which contained a bluesy classic rock sound and sold five million copies. In 1992, Def Leppard followed up 1987's Hysteria with Adrenalize, which went multi-platinum, spawned four Top 40 singles and held the number one spot on the US album chart for five weeks.
Guns N Roses released both Use Your Illusion albums in what year?
1991