Madame De La Grande Bouche is an opera singer who is becoming a wardrobe. Madame is larger-than-life in everything she does, including her singing and dancing. Look for that student who can portray the ultimate  diva with a heart with an outsized personality and voice. Madame has some harmony lines with Mrs. Potts and Babette, so cast a singer who can hold her own but knows when to pull back in order to sound good with the others.