its not hard you take the song you want and follow these steps

1. make sure its a mp3

2. then add it to the folder called sounds

3. call the song the location were you wish to here is i.e you call it deck if you want to listen to to it while sorting out your deck

if you covert them to mp3 files then you can

in the percy version in the sound folder at the very top there is a guide, the file is called how to add songs just follow those steps