Upon its 1975 release, A Night at the Opera was, reportedly, the most expensive album ever recorded. Fortunately, Queen got their money's worth—and then some. Their crowning achievement, this fearlessly eclectic album takes equal inspiration from heavy metal and '20s music hall on tracks like "I'm in Love with My Car" and "Lazing on a Sunday Afternoon,” respectively. And that's before the staggering hard rock operetta "Bohemian Rhapsody," a cracked masterpiece that no other band could’ve pulled off.