In terms of experimentation, it may not be too far-fetched to say that much of popular music in the half-century after 1967 has come under the influence of The Beatles‘ Sgt. Pepper’s Lonely Hearts Club Band. The group’s unique adventure in sound, songwriting, studio technology, and even cover art had an immediate impact when the album, which went on to become the biggest-selling UK record of all time, was launched on May 26, 1967.