If you want to use a popular song, make sure you have the proper license from one of the licensing organizations such as ASCAP or BMI in the U.S. You can use a free audio editor such as Audacity to cut out the section you want and save it as an MP3 or WAV file that can easily be incorporated into your PowerPoint presentation. When I was flying home Tuesday night from St. John’s, I was tired after speaking the two days and instead of pulling out my laptop, I plugged in my noise cancelling earphones and watched a light hearted movie.