This album's an interesting point in history.
It contains the track, Warrior, which is arguably the first power metal track ever recorded, even going back further than this album's 1977 release all the way back to a 1975 demo.
Excluding other late 70s tracks from this band, power metal wouldn't become a thing for another 6-7 years after this.
Despite being American, Riot was extremely popular in Japan and is often credited for being the biggest influence on the 80s Japanese power metal sound.
Great guitar solo towards the end too.
I need to check out Sky more, I've only heard one track of theirs (well, two now).