Vocals.. singing.. whatever. I put Britney at 2 because seriously, if you take some songs off - she has a really good voice and singing and I'm not saying it because I love her. Anyway notice the numbers are different because the last one should be....
I know I'm forgetting someone:
4-5/5-4. Madonna - Amy Lee.
2. Britney Spears
1. Beyonce!!!
3. Aaliyah <3 R.I.P.