Vocally?
her best song vocally? mmm Something between "Soda pop", "From the bottom of my broken heart", "Thinkin about you", "Overprotected", "I'm not a girl not yet a woman" and "Toxic" ... I can't decide
Definately her "Baby one more time" album is her best one vocally.
her worst song vocally could be: Big fat bass , and her worst album vocally could be "Femme Fatale"
