Extremely progressive; it has the 'vibe' of something The Outer Limits era Voivod could've done; when the riffs kick in, it carries a Zeppelin 'groove' and if I had to get a reference, for the first verses, it would be Uriah Heep, at the end of David Byron's era (I read some saying it could be something Yes and/or Genesis, colud do, early in their career, but, can't see it). Great vocal lines, varied riffs, crazy tempo and rhythm changes. There's self plagiarism from the riff in 'The Edge Of Darkness', with a different harmony, but, I love the song and this riff, therefore, it doesn't spoil anything.
Don't know if it'll be a classic, but, it's a sensational song.