The best discussion of the &quot;Happy Birthday&quot; copyright brouhaha is by the wonderful Vi Hart:<p><a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=AVo0Q8G8tS8" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=AVo0Q8G8tS8</a><p>Not only is her biting commentary on the insanity in copyright law succinct and direct, her <i>musical</i> analysis of the differences between the original &quot;Good Morning To All&quot; and the modern &quot;Happy Birthday&quot; is <i>very surprising</i>.<p>Did you know the song modulates to 4&#x2F;4 time for one measure? Even though the song is always notated as never leaving 3&#x2F;4?