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

Changes

Black Sabbath 70's

"Changes" is a song by the British rock band Black Sabbath, released in 1972 on their album "Vol. 4." Composed by the band members Ozzy Osbourne, Tony Iommi, Geezer Butler, and Bill Ward, the track is in the key of C major. It stands out from the band's usual heavy metal sound, featuring a melancholic piano melody and introspective lyrics about love and loss. Interestingly, "Changes" became one of Black Sabbath's most commercially successful songs, showcasing their versatility as musicians beyond their trademark heavy metal style.