Perfect 4ths Playing by Ear 1 2 In this lesson, you will hear a Perfect 4th, then play it by ear. It is called Perfect because of its strong, pure sound. Perfect 4ths often sound noble and heroic. Here are some examples of Perfect 4ths.January 1, 2013 1 2 In this lesson, you will hear a Perfect 4th, then play it by ear. It is called Perfect because of its strong, pure sound. Perfect 4ths often sound noble and heroic. Here are some examples of Perfect 4ths. Perfect 4th – Up Bridal March You’re Finished!