While the world hears a "new" masterpiece, Jack experiences the isolation of being the sole guardian of a lost legacy.
In the film, Jack Malik (Patel) performs "Yesterday" for his friends after a global blackout erases The Beatles from history. Himesh Patel - Yesterday (From The Film Yesterday)
It serves as the audience's proof that the world has changed. While the world hears a "new" masterpiece, Jack