These are not intended to represent every musical composer from each musical era. It is a listing of the most renowned and commonly accepted composers of musical innovation and discovery during these periods. Many well known musical composers lived very short lives as was common to the life of the time. Certainly some composers lives would intersect different eras of musical discovery and some of those wrote compositions pertinent to both periods. This is not to say that composers of any period did not compose with the innovations of another period. They most certainly did and still do today. The entire reason for innovation is implementation into future works.