How to change to default battle music?

First off, congratulations to the EB II team for an amazing mod! A veritable deluge of faction building descriptions, new interfaces and icons, as well as units - great attention to detail, as expected.

Anyone know how exactly could I revert the battle map music back to the original Medieval 2 Total War battle tracks? The EB tracks are exquisitely composed and fit for the period, but after 6 years of playing EB I hundreds of times they have become quite embedded into my head already. I've never played Medieval 2 before so would like to sample. I'd like to keep the campaign map music from EB also.

Thanks!