Can I use this song in my advertising? How many notes do I have to change for it to be considered original and not illegally copying that smash-hit, number-one song in the music charts? Being in the musical jingle business, I get a lot of calls from advertising agencies asking me if I can create a jingle for them that sounds just like such and such song by so and so. They then ask me if I can change it enough that it is not subject to copy right infringement.