I was thinking about a song today that i had heard on the radio a few years back. It had a female singer liek a angry norah jones. The song started with female vocals and piano(very classical). Then about 1/3 of the way into the song it blends with a rap beat and vocal. Very popular song heard on the radio for months starting about 2-3 years ago. I'm sure this wont stump too many people.
