Summary:
1. Copper is a base metal that has a high level of electrical and thermal conductivity while brass is an alloy of copper and zinc.
2. The color of copper is reddish-orange while the color of brass is usually yellow because of its zinc content.
3. Musical instruments that are made of copper have soft and mellow sounds while those that are made of brass have a higher pitched sound.
4. Copper is softer and easier to mold while brass is more difficult to mold and cast.
5. Brass has a lighter finish than copper.