txtDefinition=The {\uldb harmonic}{\v 84040} system that coalesced during the latter part of the seventeenth century and governed Western art music until about 1910. Tonality is based on a hierarchy of relationships among the {\uldb triads}{\v 102827} that are built on each of the seven steps (called \'93degrees\'94) of the {\uldb diatonic scale}{\v 79572}. The adjectival form of \'93tonality\'94 is \'93tonal.\'94 The three central triads in Mozart\'92s tonal vocabulary are {\uldb tonic}{\v 101048}, {\uldb dominant}{\v 151034}, and {\uldb subdominant}{\v 108294}.
