At moments sounding like classic Queen, at others like Pink Floyd, they also mixed in classical music among their rock and synthesisers.

BBC: Muse

Before long many musicians and groups, including the Doors, the Grateful Dead, the Rolling Stones and the Beatles, were using Moog synthesisers.

BBC: Technical wizard: Bob Moog

The move to listening to computers with speech synthesisers rather than experiencing full words, letter by letter, underneath your fingertips, means that words are often heard without necessarily knowing how they're spelt.

BBC: Braille is spreading but who's using it?