You can check the name in game's file, I found them when I just mess around
It's a royalty free song named "The Flower of the Wilderness" by Wingless Seraph. I'm not going to post a link here in case it's against the rules, but Wingless Seraph has a website where you can download all their music for free.
(You can't legally reupload it to youtube without buying a liscense from them though)