Classic glam rock with uber catchy melodies and style

One of the most influential albums ever made. An explosive rhythm section, fuzzy guitar riffing and ozzys oddball vocal performance all made for something very distinct in the early 70s, but even thought it's been ripped off a million times and not novel sounding any more the strength of the songwriting still is better than most albums in its genre. The opener is the standout with it's tritone based riff and eerie atmosphere but the groove heavy blues rock of NIB also is incredible. Basically every riff is catchy.