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

I'm a Believer

Smash Mouth Movies-TV

The song "I'm a Believer" is originally in the key of G major. It was popularized by the American band Smash Mouth in 2001, but originally composed by Neil Diamond in 1966. The track was first recorded and released by The Monkees in 1967, becoming a chart-topping hit worldwide. "I'm a Believer" holds the distinction of being the Monkees' biggest-selling single. The song's catchy melody is characterized by its upbeat tempo and memorable chorus. It's considered a classic pop-rock song and has been covered by various artists over the years.