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

Who Can It Be Now

Men At Work Rock

"Who Can It Be Now" by Men At Work is a popular song written and performed by the Australian rock band. It was released in 1981 and became a major hit, reaching number one on the Australian charts and number two on the Billboard Hot 100. The song was composed by the lead vocalist and flautist, Colin Hay. Interestingly, the lyrics were inspired by Hay's own experiences with anxiety and depression. With its catchy saxophone riff and upbeat rhythm, the melody of "Who Can It Be Now" is memorable and instantly recognizable.