Tolkien in modern music?

I sincerely hope that I am not violating nonsense rules with this, but I unintentionally found a modern group that sings songs based on the Sil and LOTR (The Books!). It is very obvious that 'Blind Guardian' has read the material and knows what they sing of. Most of what I have heard deals with Feanor's oath. Has anyone else heard much of them or found other similar groups?