This song is my cover of the song Ice Grotto from an old DOS game Heretic: Shadow of the Serpent Riders originally composed by Kevin Schilder. It's not an exact copy of the original, instead I wanted to mix the song a bit and especially extend it as the original was only about a minute and 20 seconds long.
As the original song was MIDI (actually MUS but close enough) there are a couple of different sounding versions of the song and in some of them it's actually quite difficult to hear the melody that can clearly be heard in my cover. Anyway, I based my cover mostly on this version: Ice Grotto on YouTube
You can also get a high definition version of the cover art here.