Emerging in the late sixties via the inclusion of classical, jazz and occasionally folk elements into pop/rock music, progressive artists sought to push the boundaries of what ‘rock’ means. From Atomic Rooster to Frank Zappa, from Space Rock to Krautrock, this genre is for explorers, for those with curious ears, for travellers who enjoy departures from three chords and a regular backbeat. Extended compositions and virtuoso performances are two of the hallmarks of prog. Lyrics expanded too, sometimes leading to epic compositions lasting an entire album-side. Meanwhile, the development ...