title: Commenting code in Scheme
body: <p>I am looking at some code in <code>Scheme</code> from <code>Festival</code> and cannot seem to figure out the comments. Currently, I can see <code>;</code>, <code>;;</code> and <code>;;;</code> used to indicate comment lines. Other sources on the web indicate that some of the above maybe ways to indicate multi-line comments. My questions are:  </p>
  
  <ol>
  <li>What is the difference between <code>;</code>, <code>;;</code> and <code>;;;</code> for commenting?  </li>
  <li>When is one to be used over the other?  </li>
  <li>Is there any other, IMO saner, way to comment code in <code>Scheme</code>?   </li>
  </ol>