I was trying to avoid having to nitpick every bit of it, which is why I gave references. How many people have only sung "Happy Birthday" at home, but never in a restaurant or any other public place?

Here's the rest of your quote, starting right after that "no" -

"Royalties are due, of course, for commercial uses of the song, such as playing or singing it for profit, using it in movies, television programs, and stage shows, or incorporating it into musical products such as watches and greeting cards; as well, royalties are due for public performance, defined by copyright law as performances which occur "at a place open to the public, or at any place where a substantial number of persons outside of a normal circle of a family and its social acquaintances is gathered." So, crooning "Happy Birthday to You" to family members and friends at home is fine, but performing a copyrighted work in a public setting such as a restaurant or a sports arena technically requires a license from ASCAP or the Harry Fox Agency (although such infringements are rarely prosecuted)."