Answer:
Because each music of each period has its features that represent the historical moment when this music is part of. The period is the responsible to create the motif, the meaning and the way how the composers would conduct their songs. That's why you have to adapt for the period you choose, because you have to emulate the sensation, the style, and the meaning of the song.
Explanation:
For example, if you choose the Baroque, what you have to keep in mind? First, you have to look at the period and the ideas of that time. Baroque is an art movement that emerges in the 17th century and has the feature to contrast light and darkness, good and evil on its portraits. In music, these ideas are used too. The masters used cellos, violins, organs, violas, harpsichords (piano-like instrument) and also the pianos. It's a deep and strong music style, and you have to adapt to the use of the instruments to obtain the right result.
