Godsmacks fourth studio album, IV, was their second consecutive album to top the Billboard 200 chart when it was originally released in 2006. Bringing in Led Zeppelins producer/engineer Andy Johns, gave the album a heavier yet more melodic sound for Godsmack. A personal achievement for the band, this album includes the rocking anthem, Speak, their fourth #1 single on the Billboard Mainstream Rock chart, as well as the hits, Shinedown and The Enemy.