Here is an old Marenghi Organ playing "Bohemian Rhapsody" by Queen. While it's not a classic fairground organ song by any means, this video does an excellent job of showing how a fairground organ works. Plus it sounds great too in my opinion!
This is a picture of the 1854 $3 gold piece I'd love to own, mintmarked "D" below the wreath, D standing for "Dahlonega" where the coin was minted.