They need haircuts badly. Not my kind of music, but I don't know anything about all the band names out right now. They are not Christian musicians, correct?
Apocolyptica started out as an all cello metallica tribute band in the mid 90's. Their first album was all Metallica songs. They have kept up the trend but do other metal bands' songs on cello now.
They are some of the most talented musicians I have had the privilege of meeting. I got to meet them and see their first(and only one for over 10 more years) U.S. performance at the 1999 NAMM (National Association of Music Merchants) when I owned my guitar store.
Here is another musician I have gotten to meet and photograph for her publicity photos. If you ever see her in concert and buy an 8x10 of her, I took the photo.