"New" - EVANESCENCE - Going Under - Backing Track At Soundback

http://www.soundback.co.uk/ will be featuring a backing track each day. Today's song and featured backing track is "Going under" by "EVANESCENCE"

http://www.soundback.co.uk/EVANESCENCE-backing-tracks/Going-Under/2399.php

What might you suggest be the meaning of  Evanescence?

Answer on a blog post.