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With the growing popularity of rock music in the mid-to-late Sixties, a great many young up-and-coming musicians were inspired — and encouraged — to push the limits of the musical form beyond anything that had come before.
The very roots of what was to become known as the progressive rock movement may be hard to pin down, but no doubt the musical experimentation of the Beatles, the Rolling Stones and Bob Dylan encouraged an ever-widening musical palette, inviting the musical creativity of early progressive bands like Pink Floyd, the Moody Blues, Soft Machine, Procol Harum and Frank Zappa's Mothers of Invention.