By Mildred Hill and Patty Hill.

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Tracks that Happy Birthday to You references:

• Good Morning to All by Mildred Hill and Patty Hill

Tracks that reference Happy Birthday to You:

From Beyond:

• Birthday Girl by Witch's Cadence
• Mayday by RoZ8

Lyrics:

Happy birthday to you!
Happy birthday to you!
Happy birthday, dear ____!
Happy birthday to you!

Artist commentary:

Niklink: (wiki editor)

Variously known as "Happy Birthday" or "The Birthday Song". You're supposed to say the name of whoever's birthday it is where that blank line is in the lyrics. In case you didn't know somehow.