Selling over forty-five million copies, The Dark Side of the Moon topped the US Billboard charts when it was first released in 1973 and took up residence there for over 700 weeks. Lunacy delves into the making of this iconic record and why it continues to speak to generation after generation of music lovers around the world.

Music biographer John Kruth starts with Pink Floyd’s band history, leading up to the creation of their masterpiece and exploring what inspired the “sonic stew” of styles—a mixture of avant-garde electronic, jazz, and classical music all contributed to the timeless album. With interviews of musicians, artists, DJs, and fans, Kruth gets to the heart of the lasting importance of The Dark Side of the Moon.

Lunacy also looks at Pink Floyd after the departure of the band’s original leader and visionary songwriter Syd Barrett. Pink Floyd became a rudderless ship and released a series of nebulous (yet highly enjoyable) jam albums and went on tours that almost bankrupted them. Their eighth album was a make it or break it proposition, and it’s timing could not have been better.