How to play this song ?

These are single notes, not chords.
Each note must be played individually.

There are different notations, like, A B C , DO RE MI , Sa Re Ga and numeric notation 1 2 3.
Choose one that fits better for you.

You can distinguish the octave by the color of the note and if it is UPPERCASE (high pitch) or lowercase (low pitch). Enjoy

A Thousand Years

Christina Perri Pop

"A Thousand Years" by Christina Perri is typically performed in the key of B-flat major. Written by Christina Perri and David Hodges, the song was released in 2011 as part of "The Twilight Saga: Breaking Dawn – Part 1" soundtrack. One interesting fact is that "A Thousand Years" gained immense popularity after its inclusion in the Twilight film series, becoming a favorite choice for weddings and romantic occasions. The melody features Perri's emotive vocals accompanied by piano and orchestration, conveying themes of enduring love and commitment.