Happy birthday to you..." You know the song, it's one of the most widely known songs in the English language, translated and widely used in 18 more.
"Happy birthday to youuu..."
At a typical party, everybody starts singing the song at the same time, but in 12 different keys. By the second line, dominant voices have begun to define a common melody, and other voices are shifting to match it. It's still too early to say whether everybody will be on the same note by the end. Third line:
"Happy birthday dear Richard..."