Third wave glam metal artists such as Firehouse, Warrant, Extreme, Slaughter, and Skid Row experienced their greatest success at the start of the decade, but these bands' popularity waned after 1992 or so. Mötley Crüe and Poison, who were hugely popular in the 1980s, released successful albums in 1989 and 1990, respectively, and continued to benefit from that success in the early part of the decade. The Black Crowes ushered in a more classic rock 'n' roll sound with their successful debut in 1990. More well-established hard rock artists such as Guns N' Roses, Van Halen, Def Leppard, Ozzy Osbourne, and Tom Petty released successful albums and remained very popular in the first half of the decade, while Aerosmith, Bon Jovi, and Metallica maintained their popularity throughout the entire decade, largely by re-inventing themselves with each new album and exploring different sounds.