The Mozart Piano Sonatas, Vol. 4

A sonata is a multi-movement work for one or a few instruments that developed as a principal vehicle of instrumental expression in European art music. In the Baroque era it referred broadly to “music to be sounded” (as opposed to “cantata,” music to be sung) and commonly appeared as the trio sonata (two treble instruments plus basso continuo) in church (sonata da chiesa) or chamber (sonata da camera) contexts. In the Classical era the term narrowed to denote a cyclical, architecturally unified piece for solo keyboard or for a solo melody instrument with keyboard, typically in three or four movements with the first movement in sonata form (exposition–development–recapitulation). Across the 18th–20th centuries, composers used the sonata as a laboratory for harmonic drama, motivic development, and contrasting characters—ranging from the poised clarity of Haydn and Mozart to the structural expansiveness and psychological depth of Beethoven and Romantic successors.

Classical music is the notated art-music tradition of Europe and its global descendants, characterized by durable forms, carefully codified harmony and counterpoint, and a literate score-based practice. The term “classical” can refer broadly to the entire Western art-music lineage from the Medieval era to today, not just the Classical period (c. 1750s–1820s). It privileges long-form structures (such as symphonies, sonatas, concertos, masses, and operas), functional or modal harmony, thematic development, and timbral nuance across ensembles ranging from solo instruments to full orchestras and choirs. Across centuries, the style evolved from chant and modal polyphony to tonal harmony, and later to post-tonal idioms, while maintaining a shared emphasis on written notation, performance practice, and craft.