Disney Princess Musical Base . Each Princess is RFID (radio frequency identification) enabled, which is a type of technology that uses radio waves to automatically identify objects. Similar to barcode, but it does not rely on line of sight scanning as a barcode does. So when you place a Princess onto the musical base, the appropriate tune will be played. Six Disney Princess figurines with six tunes are available for use with the Sonata Musical Base: Ariel - "Part of Your World", Aurora - "Once Upon a Dream", Belle - "Beauty and the Beast", Cinderella - "A Wish is a Dream Your Heart Makes", Jasmine - "A Whole New World" and Tiana - "Almost There". Figures are sold separately. .