@Defiance assuming you mean "the eighties" in a charting popular music context (leaving out punk, metal, proto electronic music, the nascent jam band scene etc) the two things I see missing there are the phases of MTV influence (which imo is the defining axis of the decade in that pop culture sense) and the major early stages of rap development (everything up to The Message, then Run-DMC, Beastie Boys, Public Enemy all being major signposts, etc)