Music operates in cycles and waves, with the energy generated from one, feeding directly into another. This is one of the major ways that we see genres and styles achieve growth. One particular genre that we have seen outgrow its roots and reach with newly grown tentacles into ever-evolving styles is hardcore. Just look around at the number of sub-genres that include the affix of “core” to their names. In this piece we look at the bands who evolved hardcore in both subtle and major ways to arrive at what we now know as "metalcore." First, we take a look at some of the bands who were most directly tied to hardcore in its last iteration before metalcore truly came into being.