The ninth volume in Madacy's year-by-year overview of the biggest hits of the '70s and '80s, Rock On 1978
captures a pivotal moment in music history. By 1978, disco had been completely assimilated into the mainstream thanks to massive hits like Frankie Valli
's chart-topping "Grease" and the Trammps
' "Disco Inferno," new wave was still in its infancy but spawning records like the Cars
' "Just What I Needed," and the era of country-pop was beginning with Number One pop hits like Exile
's "Kiss You All Over."