music is not emotional, it triggers emotions

 tonality, pitch, chords, do not themselves contain 'emotions'.  throughout our lives we are exposed to music played nearly constantly for television, radio, and everything else

this music is set to visuals or stories or narratives and the chords are chosen accordingly based on 'music theory'.  once you have absorbed enough of this subconciously, chords are able to trigger these stored memories associated with external media/stimuli/experiences

musicians do not in some mystical magical sense channel emotions into music.  music is a series of mathematical equations, tonality is mathematical, rhythm is mathematical.  musicians train their brain to translate human emotions into sequences of numbers and patterns that will correctly trigger the responses in the listener which they themselves experience

this is also one of the obstacles that some music faces when transcending culture, although the beauty of the musical sounds itself is preserved, sometimes the original meaning or intent can be lost.  much like facial recognition trying to analyze peoples facial expressions across various cultures, peoples facial expressions don't always match to a specific emotion in every culture, just like chords don't universally map to emotions.