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I need help to make a car air horn that plays the Imperial March? Answered

 I don't want an electric mp3 horn, I want it to be similar to the horn on the General Lee.  Is there a way I can modify an already existing air horn set up? 

Thanks in advance

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If you have a separate solenoid valve for each of the individual horns, then you could do it by programming a microcontroller (like an Arduino or Picaxe) to trigger each valve for the right amount of time, in the right order.

A real old-school engineer could probably work out a purely mechanical solution, akin to a music box where the turning cylinder has pins to trigger each valve in turn.

Type that exact sentence into Google, and you'll find more answers than you will know what to do with.

This is exactly what I was needing thanks!