As the title says.

I love the Skyrim music, especially the main theme. More money in Beth's pocket if they did this.

They have: https://www.directsong.com/mobile/productdetails.php?productid=2240

This has been out since before the game came out, how could you of missed it, did you even try looking? Besides if you really want it that bad just extract the bsa's, you get the full soundtrack plus all the zone specific tunes that aren't in the official soundtrack.