Its nothing like that, you can listen any kind of music, whatever u like.

This is my 5th marathon, & thats y i m suggesting it 2 u.

Hey, what kind of performance r u talking about?

music definately helps imrove performance ... depends what kind of tempo get's you going ... i like a mix of lounge music (which gives me resting period) and rock / hip hop (which makes me want to run fast)