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

Domino

Jessie J Pop

"Domino" by Jessie J is a catchy pop song written in the key of G major. It was released as the second single from her debut studio album "Who You Are" in 2011. The song was co-written by Jessie J herself, along with Dr. Luke, Claude Kelly, Max Martin, and Cirkut. Interestingly, Jessie J initially wrote "Domino" for another artist, but decided to keep it for herself after falling in love with the track. The lively melody of the song blends elements of pop and dance, featuring up-tempo beats and a memorable chorus that is sure to get stuck in your head.