I’m not sure, but I think
the Horntones FX-550
could solve this problem. This $250 after-market add-on for your chariot ties in with your horn system to transform your mild-mannered honk into a full-fledged symphony, or any other piece of music in a standard audio format (MP3 or WAV). Just plug a USB flash drive into the player to upload the song of your choice, and Horntones takes care of the rest. You could have different horn sounds for polite beeps and the far more useful—in Boston, anyway—”get the hell out of my way” honks.
May I humbly suggest “Stop! In the Name of Love” and “Drive My Car” as your first musical honks. Me? I’m thinking about sampling a laser cannon sound from Star Wars: that would just be as cathartic as all get out.