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

The Answer Lies Within

Dream Theater Heavy Metal

"The Answer Lies Within" is a song by the progressive metal band Dream Theater. It was originally released in 2005 as part of their album "Octavarium". The song is written and composed by the band's keyboardist, Jordan Rudess. The track's tonality is in the key of E major. One interesting fact about the song is that it features a soothing and melodic atmosphere, with introspective lyrics and a memorable piano melody.