It is difficult to determine the most popular song in history, as popularity is subjective and can vary greatly over time and across different regions and cultures. However, some of the most widely recognized and enduring songs include:

- "Happy Birthday to You"
- "Auld Lang Syne"
- "For He's a Jolly Good Fellow"
- "Jingle Bells"
- "Deck the Halls"

In terms of commercially successful songs, some of the all-time best-selling singles include:

- "White Christmas" by Bing Crosby
- "Imagine" by John Lennon
- "Billie Jean" by Michael Jackson
- "Bohemian Rhapsody" by Queen
- "I Will Always Love You" by Whitney Houston

It is worth noting that these songs are primarily popular in the Western world and may not reflect the most popular songs in other regions of the world.
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