First heard by most Americans via 1977's seminal Let There Be Rock album, "Problem Child" had actually first appeared on the previous year's Dirty Deeds Done Dirt Cheap opus (at the time, still unreleased stateside). One of AC/DC's best-known early classics, the song was tailor-made to exploit guitarist Angus Young's on-stage schoolboy character ("What I want I stash, What I don't I smash, n' you're on my list"), but its brilliantly simple riff also epitomizes AC/DC's three-chord hard rock boogie in its inimitable, minimalist perfection. Arguably the centerpiece of the excellent Dirty Deeds album, the fact that it was never even given a single release also stands as a testament to AC/DC's workmanlike, blue-collar ethic. Which brings up another interesting point about AC/DC: namely how pretty much every aspiring rock guitarist (and "problem child") learns his chops jamming on the band's simple songs, but few eventually muster the moxie to cover them. A staple of the band's live set throughout the '70s and early '80s, many consider "Problem Child"'s explosive rendition on the If You Want Blood You Got It to be definitive.