The "Tristan Chord," introduced by Richard Wagner in his opera "Tristan und Isolde," revolutionized music theory. This ambiguous chord defied traditional tonality and resolution patterns, leading to modern harmonic exploration. Its unresolved tension mirrors our own unresolved emotions, epitomizing music's power to express the ineffable. Have you encountered a piece of music that challenged your perception or connected deeply with your personal experiences? Share how it moved you or reshaped your understanding of music.