EMNT Just Dance 4 playstation 3 (PS3/sony_playstation3)

Do you have to used the Play Station move system (controlers, camera; etc) to play this game??

For the xbox versions you can purchase and download songs, can you do that for this game on the PS3 system?

Do you have to used the Play Station move system (controlers, camera; etc) to play this game??

Is the dance mat not required? And can it still be used in conjunction with camera and wand?