How do you make music using a store bar code reader? Well, maybe you might ask why first, but here we go. A bar coder generates sounds by connecting the scan-signals of a barcode scanner t,o a powered speaker instead of the typical store cash register. If you know what you are doing, you can make some really cool noise, ah, music with these things! Note how these creative folks make some funky music. The next time I am at the self checkout at the grocery store, I will try this and let you know what my eggs, milk and bacon sound like.