On March 1, 1973, Pink Floyd released an album that would go down in history. Fifty years later, the craze for The Dark Side of the Moon, a masterpiece of progressive rock and experimental music, with a circulation of 45 million copies, is undeniable. Early life fans still remember the first time they heard the metallic sound of the cash register at Moneythe ticking of clocks Time or the hovering sax of Us and Them.