Final answer:
In the 1970s and 1980s, important rock and roll groups included Led Zeppelin, Pink Floyd, The Rolling Stones, Queen, and The Eagles, who played significant roles in both the music industry and cultural movements of the time.
Step-by-step explanation:
In the 1970s and 1980s, rock and roll experienced a transformation and a burgeoning of new styles, with many groups achieving significant importance. For example, bands like Led Zeppelin, Pink Floyd, and The Rolling Stones defined the era with groundbreaking music that incorporated elements of blues, hard rock, and psychedelic rock.
These groups, along with others like Queen and The Eagles, continued to sell out stadiums worldwide and amassed large fan bases. They not only contributed to the music industry's profits but also influenced social and cultural movements of the time.
Technological advances in recording and distribution, along with venues like radio and television, propelled rock music to new heights. Iconic events like Woodstock became historical landmarks for the music genre. The music of rock bands during this period often embodied themes of rebellion, freedom, and youth culture, reflecting the social dynamics of the time, including the ongoing civil rights movement.