Adafruit novelty car horn

HELP NEEDED TO USE AN ADAFRUIT POWER BOARD TO MAKE A CAR HORN TO PLAY VARIOUS HORSE SOUNDS IN A 1966 MUSTANG CAR. SEE https://www.youtube.com/watch?v=smhMLsP5fsM.
WHAT PARTS DO I NEED, WHERE TO GET THEM AND HOW TO WIRE UP.