'Happy Birthday' song is considered to be the most sung song in the world. The song is not only rendered on birthdays, but also captured in various forms such as sound recordings, videos, etc. A search on YouTube with the phrase, 'Happy Birthday', yields About 3,770,000 results, indicating its popularity. The 'Happy Birthday' song includes two elements, lyrics and musical composition. Simply put, it includes the words and the tune.     Warner/Chappell Music was claiming copyright ownership of the lyrics, and…