Their keyboards sound very happy to me, they are kind of accordeon-like. Notice how they incorporate folky dance- around- the- maypole bits of music in almost every song, or at least the rhythm (especially those fast parts).
And yes, I really like the band.
As for
Amon Amarth, I can say that almost all people I know that like
Death Metal now, used to listen to them 5-6 years ago. They were quite big in my hometown, and I believe almost anywhere, especially when 'Fate of Norns' came out. Sure they can definetely use some change in their music, but they are pretty ok - and still worth going to their concert
.
Ac/Dc is not metal, but it's a fun band that I grew up with. And they don't need to change their style, they are perfect just the way they are.
When in Danger or in doubt,
Run in circles, Scream and shout.