Final answer:
Copyright purposes to protect original works of authorship like books and music, not ideas or inventions which are covered by patent law.
Step-by-step explanation:
Out of the options provided, copyright can control books and music, as they are considered original works of authorship that are fixed in a tangible form of expression. Copyright is a legal protection against unauthorized reproduction, display, or performance of these works, and typically lasts for the life of the author plus 70 years. Ideas themselves are not copyrightable, as copyright does not protect concepts or abstract notions. Inventions are instead covered by patent law, which grants inventors exclusive rights to make, use, and sell their inventions for a limited time.