"Tonality: Music Theory" most likely refers to the , a comprehensive chord and scale reference tool for musicians on iOS and iPadOS . It can also refer to the core music theory concept of tonality , which defines the hierarchical relationships between pitches and a central "tonic" note. 1. Tonality (iOS/iPadOS App)
: Uses machine learning to identify chords in real-time via the microphone. Tonality: Music Theory
: An interactive layout to modify inversions and extensions on the fly. "Tonality: Music Theory" most likely refers to the