A tonal system is a musical system that uses a specific set of pitches to create a hierarchy of tonal relationships. The tonal system has been referred to by different names over time, including a tonality, key system, diatonic system, modal system, or scale system. These terms all describe the basic concept of a tonal system in different ways. The diatonic system, for example, emphasizes the use of the seven-note diatonic scale in tonal music. Similarly, the modal system refers to music that is based on modes, while the term scale system describes the use of scales as the basis of tonal organization. Regardless of the terminology used, a tonal system is a fundamental aspect of music theory and practice.