Baroque composers systematized instrumental genres—the sonata (fast-slow-fast), concerto (featuring a solo instrument against full ensemble), and suite (sequence of stylized dances)—establishing templates for large-scale instrumental music. These forms exploited tonal tension (modulation to related keys) and motivic development, setting the stage for Classical symphonic architecture.
Hear a Baroque sonata (Corelli, Vivaldi) and a Baroque concerto (Vivaldi concertos, Bach Brandenburg concertos) back-to-back to notice differences in texture (accompanied solo versus ensemble dialogue) while recognizing shared harmonic language and sectional structure.
From your study of baroque historical context, you know the era's broad coordinates: the rise of tonality, the dominance of the basso continuo texture, the courts and churches that commissioned music, the aesthetic of elaborate ornamentation and affective expression. Baroque instrumental music is where those forces converged with a new organizational challenge — how do you build a large, satisfying piece from purely instrumental materials, without text, liturgy, or drama to provide structure? The answer was the development of three genre templates that each solved the problem differently.
The sonata in the Baroque era referred to any multi-movement work for one or a few instruments, but the most influential type was the trio sonata — typically two melodic instruments over basso continuo. Corelli's standardization of the slow-fast-slow-fast sequence of movements (the sonata da chiesa, or church sonata) gave composers a predictable architecture: opening with a slow, stately movement to establish key and character, then releasing energy in a fast fugal or dance-like movement, then settling into an expressive slow movement, then closing with a brisk finale. Each movement was internally organized by tonal architecture — departure from the home key, excursion through related keys, and return — which is the same harmonic logic that would govern sonata form a century later, now operating at the movement level.
The concerto solved the structural problem differently: through contrast of texture. Vivaldi's mature concerto form set a soloist (or small group, the concertino) against the full ensemble (the ripieno), alternating between ritornello passages — recurring material in the full orchestra that anchors the tonal structure — and solo episodes that develop motivic material and explore other key areas. The ritornello functions as an architectural frame: its returns mark structural arrivals even when it appears in new keys. This is a fundamentally visual-architectural approach to form: the ritornello is a recurring landmark you can orient by. Vivaldi's concertos were so widely copied and studied that Bach transcribed over a dozen of them, absorbing the ritornello principle into his own cantatas and keyboard works.
The suite took a different path: instead of creating new forms, it assembled existing ones — stylized dance movements (allemande, courante, sarabande, gigue, with optional additions like gavotte or minuet) into a coherent sequence. Each dance movement is in binary form (two repeated sections), the first ending in the dominant or relative major, the second returning to the home key. The suite's unity comes from the shared key of all its movements and the contrast of character between dances (the dignified allemande, the flowing courante, the slow and stately sarabande, the energetic gigue). Bach's keyboard and orchestral suites are the summit of this genre. Together, these three genres established the basic toolkit of multi-movement instrumental architecture that Classical composers would inherit and transform.
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