Bring on Rockabilly! So 1950's and actually it is deemed one the earliest forms of rock n' roll. But all seriousness aside, this style makes it a rocking music ecard! And did you know that the characters playing the Rockabilly Birthday song are cupcakes? Yes they are! And look at the pink hair on our lead vocal, scrumptious! We were wondering how to make this singing birthday ecard more festive and after going back and forth about balloons and streamers, birthday candles as back vocals perhaps? That works! We did keep in mind the streamers by adding dancing air streamers and they sure have amazing dance moves. Go baby go!