Let's make something clear.
I've been getting a lot of these messages a good while now, and they are completely unnecessary.
You don't need to ask remixing permissions from people in general, especially not from me. It's an another case when you start using the music in places, particularly commercially (as in you make money with it).
If you want to know what you can do with people's music in this site, check this box out in every track's page:
When you open the "Commons Deed" link, you will be faced with basic information what you can do with it:
This is my default license.
It's not that hard, people.