On the subject of Arch Enemy, an interesting thing I learnt the other day!
The lead singers from Arch Enemy (Alissa) and Amaranthe (Elize) had to fill in for Annette who was ill, at a Nightwish concert in Denver.
So you have both singers on stage, they don't really know the lyrics very well, and they are singing on stage with the lyrics written on paper. Would have been quite some show to have been at.