Question: which female singer has the most octaves?
Answer: Mariah Carey. With her 5-octave vocal range and her ability to reach notes in the 7th octave vocal range as well just go back, it should come as no surprise that Mariah is the top. ... 
Christina Aguilera. ... 
Hayley Williams (Paramore) ... 
Celine Dion. ... 
Beyoncé