Troldhaugen for Tech/Ext or Exp Metal

Australian experimental metal band that uses elements of Edvard Grieg's classical music in their work. Very similar to Diablo Swing Orchestra or Unexpect (though a bit less complex than the latter)

They are quite heavy and fun. Honestly this is one of the most exciting and plain fun metal album's I've ever heard. They kinda sound like what I expected Psychotic Waltz to sound like when I heard that band's name.

From their site:

A terrible attack at a Mexican fiesta, a dark ride through the underworld, spooky bayou voodoo and space travel are just some of the tasty delights you'll find in "Obzkure Anekdotez for Maniakal Massez", the latest installment from TROLDHAUGEN. This wily collection of twisted tales showcases the band's inclination towards all that is weird and wacky, not once letting up on hard hitting rhythms, technical instrumentality, lush orchestrated insanity and acrobatic vocal stylings! Obzkure Anekdotez for Maniakal Massez is released through Bird's Robe Records.