I know this was already answered but if you wanna know then I’ll tell you in detail.
Mandy Moore who appeared on Grey’s Anatomy,Princess Diaries and A Walk to Remember sings and voices Rapunzel which was going to be taken by Kristin Chesworth who was in Wicked the Broadway musical with Idina Menzel but she turned down the role for Rapunzel which at first was going to be called Rapunzel: Unbraided but Disney changed the name to Tangled. The guy that’s voicing Flynn is Zachary Levi who is in Chuck as the physic detective.
Mandy Moore - Rapunzel
Zachuary Levi- Flynn Rider
Donna Murphy- Mother Gothel
Brad Gratett- (voices one of the thug characters) I recognized his voice from trailer and I can't remmber who the other actors are?