The Brain on Jazz and Rap - How does the Brain do Creativity?

This is an interesting look at fMRI studies of the brains of musicians, both rap and jazz, who perform both learned, memorized music and improvised music. What is the difference in the brain when we step things up to the level of creative performance, such as improvisation in jazz or free-style rap? Check it out, as this is one of the initial studies into creativity and the brain.