When Did The Tradition of The Happy Birthday Song Begin?

The Strange History of Birthday Celebrations - The Atlantic

Jan. 19 in Music History: Happy birthday, Dolly Parton

The Confusing History of “Happy Birthday”, by Paulo Camacho, All Things Picardy

The Birthday Song Copyright History

June 1 in Music History: Happy Birthday, Brandi Carlile

The History of The Most Widely Sung Song: 'Happy Birthday' - HOME

The Happy Birthday Song is the Highest-Earning Single in History

History of the Happy Birthday Song

Culture Re-View: Did you know that 'Happy Birthday' is highest-earning single song in history?