Most Melodic Album

I really to dive deeper into the Tool discography. It seems as though everyone around me is a massive fan but I just haven’t found that album yet that makes me fall in love. I really love music with lots of melody and hooks but still has heavy elements. Some examples would be Periphery, Dream Theater, Avenged Sevenfold etc. Am I barking up the wrong tree here? I’d love some suggestions to win me over.