GLOOM SUN SOLITAIRE is metal. Although here in Finland this kind of metal is pretty much considered as easy listening. You know, there’s some clean guitars and melody. And if there were vocals, it most likely wouldn’t be growling, snarling or screaming in pain.
About the specific genre within metal… I don’t know, man. I’m an old metallist allright, but I’ve completely lost track of the ”new” genres. There’s guitar melodies in thirds, simple power chords and a short passage with some fancier chords, so I’m just going here with the definition of ”classic metal”.
The guitar tuning is Drop D, which is awesome. Two more notes on the bottom without sacrificing any brightness.