Some television theme songs are so recognizable that just a few notes instantly bring back memories of favorite characters and storylines. What many viewers don't realize is that these iconic tunes often have fascinating origins involving last-minute rewrites, unexpected performers, unusual recording sessions, or surprising creative decisions. Here are 20 famous television theme songs whose real-life backstories are every bit as interesting as the shows they introduced.

In the 1950s, Robert Mitchum was THE Hollywood heartthrob, and his rugged good looks and charming indifference made women across the country swoon. But behind the allure lay a troubled soul marked by betrayal, scandal, and notoriety. Trust me—this close-up will shock you.

Gene Barry moved effortlessly from Bat Masterson and Burke’s Law to The Name of the Game, Broadway, and late-career revivals, continually reinventing his sophisticated screen image across changing television eras.

Ariana Richards and Joseph Mazzello gave Jurassic Park its human terror, wonder, and heart. Decades later, their lives moved in very different directions.

Play one of these songs at a party full of Baby Boomers and you'll barely have time to finish your drink before the dance floor is packed. But if you're standing near an exit, you might want to take a few steps to the side to make room for the wave of Millennials heading in your direction also.

Then The Streets of San Francisco put his weathered face, rumpled authority, and unmistakable voice into American living rooms every week. As Lieutenant Mike Stone, Malden transformed a respected character actor into one of television’s most familiar and trusted stars.