While Emma Watson certainly isn’t Paige O’Hara, the original voice of Belle, the amount of fine tuning needed to make the song work for her is minimal.
The biggest risk that Beauty and the Beast may be taking is simply associating new voices with these classic songs.
The sound of Emma Watson’s voice fits and feels at home in the music.
So many of these songs are so popular that hearing any other voice singing them could hit a sour note with audiences.