Among other things,
Americhip produces chips to let advertisers integrate sound into just about any kind of printed matter:
books,
POP,
magazine inserts, and even
packaging. Pictured above is what they claim is the first ever magazine insert with sound for Twix that quips: "Twix. Two for me. None for you."
Related post:Musical Greeting Cards (how they work, and more)
Keywords: sound, advertising, greeting cards, music, musical, ads, print