Music is written in a certain scale, that determines which notes are mostly used.
Combinations of these notes form chords, which all have a certain sound and feel to it. Generally major chords sound happy, minor chords sound unhappy.
By playing chords in a certain order, it sounds like there is a certain flow in the music. It can sound resolved or unresolved, which brings a certain feeling. (Think of it like talking where the pitch of your voice changes and will go up if you ask a question and down at the end of a normal sentence.)
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