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Elvis Presley belongs on the short list of artists who changed the course of popular music in the 20th century. He may not have invented rock & roll, but he was indisputably its first rock star, a singer whose charisma was tightly intertwined with his natural talent for a combination that seemed combustible, sexy, and dangerous when Presley seized the imagination of America with four successive number one singles in 1956. Presley spent the next two decades near the top of the charts, weathering changes in fashion, self-inflicted career missteps, and comebacks as his music expanded and evolved. Throughout his career, he never abandoned the rock & roll he pioneered on his early singles for Sun Records, but he developed an effective counterpoint to his primal rockabilly by honing a rich, resonant ballad style while also delving into blues, country, and soul, progressions that came into sharp relief with his celebrated "comeback" in the late 1960s.

Sisters Ann and Nancy Wilson are the creative spark behind Heart, a rock group who initially found success in the mid-'70s via guitar-heavy radio hits like "Magic Man" and "Barracuda," only to reach greater heights after engineering a major pop comeback a decade later. Drawing from progressive rock, hard rock, and folk, the band's 1976 debut, Dreamboat Annie, and 1977 sophomore effort, Little Queen, helped establish Heart as a hard-hitting hitmaking machine with both hooks and attitude. Their eponymous eighth album, 1985's Heart, reached quintuple platinum status via more mainstream fare such as "Alone," "What About Love?," and "These Dreams," the latter of which scored the band its first number one single. Heart managed to land Top Ten albums in each of the band's four decades, despite taking a break in the late '90s to pursue other interests – the Wilsons did release a pair of roots-oriented LPs under the moniker the Lovemongers in 1997 and 1998.