Rockers (or leather boys, Ton-up boys, and possibly café racers) are members of a biker subculture that originated in the United Kingdom during the 1950s. It was mainly centred on British café racer motorcycles and rock 'n' roll music. Their Japanese counterpart was called the Kaminari-Zoku (Thunder Tribe/Clan/Group, or Thunderers).
Progressive rock (or art rock, classical rock, symphonic rock) is a broad genre of rock music that developed in the United Kingdom and United States throughout the mid- to late 1960s. Additional elements contributed to its "progressive" label: lyrics were more poetic, technology was harnessed for new sounds, music approached the condition of "art", and the studio, rather than the stage, became the focus of musical activity, which often involved creating music for listening rather than dancing.
Soft Rock is a derivative form of pop rock that originated in the late 1960s in the U.S. region of Southern California and in the United Kingdom. The style smoothed over the edges of singer-songwriter and pop rock, relying on simple, melodic songs with big, lush productions. Soft rock was prevalent on the radio throughout the 1970s and eventually metamorphosed into the synthesized music of adult contemporary in the 1980s.