You probably firstly need to get details for their licensing/publishing department.
I`m assuming you want to license one of their tracks for yourself to remix.
Present your case, how much of the original you want to use, in seconds, what you want to use, what your planned distribution is, projected sales if any.
Financial and marketing information is basically what they are going to want.

If you want to remix something and it will be a techno remix, don`t even bother licensing it, there isn`t enough money in the scene for any big label to bother suing over rights anyway.