But Ke$ha doesn't really sing. She just talks in tune with a funny voice. I'm not saying she doesn't sing good, but just no where near as good as Rihanna.
Ke$ha dosen't sing, she's più of a songwriter and performer. Katy Perry just shouts to disguise the fact that she can't hold a note. The End. ~ Your '' opinion '' is invalid.
Rihanna's voice is AMAZING! I saw her in concerto a few days fa and she has such a strong, unique, FANTASTIC voice! So I say 10. And anyone that says other wise needs to get their ears checked.