Sgt. Pepper's Lonely Hearts Club Band - The Beatles
The Beatles were always experimental in the studio. Always pushing boundaries, but it was pretty early on when they actually started seeing what was sonically possible beyond the norm. The Beatles' ‘Sgt. Pepper's Lonely Hearts Club Band’ was officially released in the UK on 26th May, 1967, ahead of its scheduled 1st June date, and in the US on 1st June.