During the tour for Iron Fist, "classic era" guitarist "Fast" Eddie Clarke left Motörhead and was replaced by former Thin Lizzy guitarist Brian Robertson, who would then remain with the band to record their sixth album, Another Perfect Day, in 1983. Robertson would famously clash with the grungy, denim-and-leather aesthetic of the band and would only last the one album, but what an album it turned out to be. Robertson brought a level of musicianship to Motörhead that they had never had before and, on Another Perfect Day, it meshed beautifully with the down and dirty playing and Lemmy's signature gravelly vocals. The entire album sounds thoroughly Motörhead, a mix of spit-in-your-eye rockers and introspective anthems and contains a treasure trove of excellent songs. Whether it's the killer bass that opens "Back at the Funny Farm," the catchiness of the choruses on "Shine" and "I Got Mine," the middle finger to the world on "Daning on Your Grave" and "Die You Bastard!" or the unfettered and rambunctious "Rock It" and "Tales of Glory," there's wall-to-wall metallic goodness. "One Track Mind" is probably a little too slow for its own good and "Marching Off to War" is merely OK, but they hardly diminish the overall impact. Another Perfect Day is a transitional album, bridging the punk-fueled early albums and the more traditional heavy metal albums of the band's later career, but it does so almost flawlessly. It deserves to be in your collection with Motörhead classics like No Sleep 'til Hammersmith, Overkill, Orgasmatron, Ace of Spades, and 1916.