Who is harmed when people photocopy sheet music or duplicate recorded music without permission? A. Recording companies B. Artists C. Music retailers D. All of the above

## Step 1<br />The question is asking about the potential harm that can occur when people photocopy sheet music or duplicate recorded music without permission. This is a form of copyright infringement, which is illegal and can harm various parties involved in the music industry.<br /><br />## Step 2<br />The first option, Recording companies, are directly affected by this action. They invest a lot of money and resources in creating music, and when their work is copied without permission, they lose potential revenue.<br /><br />## Step 3<br />The second option, Artists, are also affected by this action. They are the creators of the music, and when their work is copied without permission, they lose potential income and recognition.<br /><br />## Step 4<br />The third option, Music retailers, are also affected by this action. They sell music, and when their products are copied without permission, they lose potential sales and profits.<br /><br />## Step 5<br />Given that all these parties are affected by this action, the correct answer is D. All of the above.