I don't remember the name of the song, but I remember that the music video was about two boys finding an bleeding fallen angel, and they take the angel with them and put it in a barn. Then someone sets the barn on fire... and then I don't remember more.
What is the name of the band and the song?

Well, if it's music, I know how. First you have to go to http://www.wuzam.com/ and download any song you want. Then, your playlist will appear. I hope this helps!

How is it going to help me find the name of the song and the band?

Found it! It was Amaranth with the song Nightwish

I mean Nightwish with the song Amaranth