When Did The Tradition of The Happy Birthday Song Begin?

Happy Birthday to You - Wikipedia

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History of The Happy Birthday Song Informational Reading Passage and Questions

The History of Happy Birthday

Happy Birthday to You: Multiple Voicings Choral Octavo - Digital Sheet Music Download

Why Singing 'Happy Birthday' Was Illegal Till 2016?

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The Happy Birthday Song is finally in the Public Domain!

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History of the Happy Birthday Song