完形填空。 Do you know that the "Happy Birthday to You" song is the first song sung in outer space? Apollo IX astronauts 1 it on March 8. 1969. It is one of the most popular English songs of all time. Here's the story behind it.
The song was written by two sisters from Kentucky, Mildred and Patty Smith Hill. It was first published under the 2 of "Good Morning to All"in 1893. It was used as a classroom 3. Teachers sang it each day to welcome their students to the classroom.
The composer, Mildred Hill, was a concert pianist. Her sister Patty Smith Hill wrote the original（最初的） lyrics（（歌词） for the song while she was a teacher in a kindergarten in Louisville, Kentucky, where Mildred also 4.
The Hill sisters copyrighted (取得版权) their song on October 16, 1893. However, it appeared 5 their agreement in Robert H. Colemans songbook on March 4, 1924. Coleman changed prat of the lyrics to say, "Happy Birthday to You", 6 the song still had its original title. The song was then published several times over the next ten years, often with small 7 in the lyrics. In 1934, when the song was sung every night in a Broadway Musical, another Hill sister, Jessica, went to court（法院） over the copyright problem of the song. She was 8 about the theft of the song and the failure to pay to her sisters. She 9 her case. The Hill family owned the rights to the melody and had to be 10 every time the song was part of a commercial（商业的） production.
The Hill sisters, who devoted their lives to educating children, could never imagine that the simple little song would continue to earn about $2 million every year.
