Piano with Sad Emotions

Usually, the tone of the piano, guitar, or even the human voice is what conveys any kind of emotion. Many instruments can provide this kind of emotion, but because you specified the piano, this is how I would rate it. A reduced tonality, which is frequently utilized in scary or horror films, can also depict a melancholy emotion, as can a minor tonality, which refers to music in a minor key. Not all minor tonalities evoke a depressing sense; it actually relies on the performer and how they use a sequence of chord progressions to get this impact.