Cowboy Bebop - "Tank!"
Is there anything more iconic than the multifaceted intro of Cowboy Bebop? The allusion to old espionage films really sets the "cool" tone of the show and the blending of musical genres matches the varying cinematic genres of the show. This song has become so well-known that it has been riffed on in Watanabe's Space Dandy and even the hit show Archer. If any of you space cowboys aren't familiar with this one, you're missing out.