What makes Heartless by Heart notable?

The album features the title track 'Heartless,' which became a significant hit, reaching number 35 on the Billboard Hot 100. This commercial success marked Heart's growing influence in rock music during a time when female-fronted bands were gaining visibility and paved the way for future generations of women in rock. By 1978, Heart was transitioning into mainstream success following their breakthrough album 'Dreamboat Annie' in 1975. 'Heartless' was part of their evolution as they began to refine their sound and appeal to a broader audience, further establishing their presence in the rock scene of the late '70s.