Quadrilogy: Best Albums by The Best Bands

So, I noticed over time, listening to so many bands (mostly metal and rock), that how many of these bands were able to put out (especially in their early days) four albums straight that are just pure God-tier, as in they were so consistently good, that they deserved their own list. So.. here's the list. This is purely based on my preference, so if you don't see a band you like on this list, then.. it's either a mistake on my part (like I forgot - somehow?) or I just didn't like it myself. Anyways... let's go!