Aenima by Tool is a heavy metal cd. The lyrics are about lots of things in life. Things that are not necessarily mainstream - however the sale of this cd has reached mainstream numbers. So in that sense it is a very mainstream cd even though I find the lyrics to have a very underground quality about them. Song number 7 on this cd is called "Hooker with a penis" for example. The graphics on the cd cover symbols both light and dark. I guess the only way to label this cd would be call it an experience.