How did Vivaldi create contrast in The Four Seasons? adding vocal parts using different themes changing keys frequently adding sound effects

He used different themes throughout

Explanation:

In listening to the excerpts, Vivaldi did not have any vocals or sound effects in The Four Seasons.  He did use different themes throughout and depending on which section of the music, keys were changed.  However, it seems each theme (Spring, Summer, Autumn, and Winter) were each in its own key, so I believe the answer is using different themes.

"the idea of humanism is mostly adeptly reflected in renaissance art by a focus on the body itself, especially with sculpture, where many detailed portraits of the human body (such as the david) were created."

c, d, e, f, g, a, b, and c.

sometimes western music will also use solfege. the names of these are do ra me fa sol la si (or ti) and do.

to indicate a note a half step higher or lower then the original note, you would say c # (for a half a step above c) or bb (for half a step below b)