Tonal hierarchy refers to the organization of pitches in music, where certain notes are perceived as more important or stable than others. This concept is often centered around a key, with the tonic note serving as the primary pitch that provides a sense of resolution and rest. Other notes, such as the dominant and subdominant, play supporting roles in creating tension and movement within a piece. In Western music, tonal hierarchy is foundational to understanding harmony and melody. Composers use this hierarchy to create structure and emotional impact, guiding listeners through a musical journey. The relationships between notes, chords, and keys help establish a framework for musical expression.