What is most famous song?

"Yesterday" by The Beatles is often considered the most popular and famous song of all time. Written by Paul McCartney and credited to the Lennon–McCartney partnership, it was released on the album Help! in 1965 and became an international hit, topping charts in numerous countries. The song's simple yet memorable melody, melancholic lyrics, and universal themes of love, loss, and nostalgia have made it a timeless and universally recognized piece of music. Its immense popularity and enduring appeal across generations solidify its position as one of the most famous and beloved songs in history.