The Fool were a Dutch design collective and band in the psychedelic style of art in British popular music in the late 1960s. They worked closely with The Beatles in London, painting George Harrison's Mini car, John Lennon's piano and a three story high psychedelic mural on the outside of the Apple Boutique on Baker Street. The group was named in reference to the Fool tarot card.

The Incredible String Band were a British psychedelic folk band formed by Clive Palmer, Robin Williamson and Mike Heron in Edinburgh in 1966. The band built a considerable following, especially in the British counterculture, notably with their albums The 5000 Spirits or the Layers of the Onion (1967), The Hangman's Beautiful Daughter (1968), and Wee Tam and the Big Huge (1968). They became pioneers in psychedelic folk and, through integrating a wide variety of traditional music forms and instruments, in the development of world music.