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

How Could an Angel Break My Heart

Toni Braxton Pop

"How Could an Angel Break My Heart" is a soulful ballad by Toni Braxton, released in 1996. The song is originally written in the key of B-flat major and is featured on Braxton's second studio album, "Secrets." It was composed by Diane Warren and produced by David Foster. Interestingly, Celine Dion was initially supposed to record the song but later gave it to Braxton. The haunting melody perfectly complements Braxton's emotive vocals, as she sings about the heartache caused by a loved one's betrayal.