Sgt. Pepper’s Lonely Hearts Club Band is one of the foundational albums of rock & roll music. Its release in 1967 ushered in a new era of musical experimentation and performance that resonated perfectly with the tumultuous and vibrant social changes of the time. It lands near the top of every list of the greatest or most important albums of all time. But even if you’re a fan, how much do you actually know about its creation? Musician, composer, software company CEO and Beatles expert (he taught...