The orchestra and its genres

Across 1700–1900 the orchestra grew from a small Baroque band into a huge Romantic ensemble. Two genres dominate this Area of Study:

• The concerto — a solo instrument (or small group) set against the orchestra. A solo concerto pits one soloist against the tutti; a concerto grosso contrasts a small group (the concertino) with the full band (the ripieno).
• The symphony — a large multi-movement work for full orchestra, usually in four movements, that grew in scale and ambition through the Classical and Romantic eras.

Listen for the story of the orchestra: Baroque = strings plus harpsichord continuo; Classical = added pairs of woodwind, horns and timpani; Romantic = a vastly expanded body with a large brass and percussion section and valved horns able to play in every key.

Question 1 — spot the period

Baroque orchestral style

Baroque music is built on the basso continuo — a bass line played by cello or bassoon with a chord-playing instrument (harpsichord or organ) improvising harmony above it. Other fingerprints to listen for:

• Terraced dynamics — the volume changes in sudden steps (loud tutti, quiet solo), not gradual swells.
• Ritornello form — a recurring orchestral tutti theme (the ritornello) returns in different keys, alternating with contrasting solo episodes. This is the standard shape of a fast concerto movement.
• Sequences (a phrase repeated at higher or lower pitch), driving walking bass lines, and busy ornamentation (trills, acciaccaturas).
• Often contrapuntal (polyphonic) texture with independent interweaving lines.

Exam anchor: if a fast movement keeps bringing back the same tutti idea between solo passages, name the form as ritornello, not rondo.

Question 2 — name the form

Classical orchestral style

The Classical style prizes balance, clarity and elegance. Textures become mostly homophonic — a clear tune over an accompaniment — and the continuo fades away as the orchestra fills in its own harmony. Key features:

• Periodic phrasing — tidy, balanced phrases in question-and-answer pairs (an antecedent phrase answered by a consequent), often four bars plus four bars.
• Alberti bass — a broken-chord accompaniment (lowest, highest, middle, highest) that keeps the harmony gently moving.
• Graduated dynamics — real crescendos and diminuendos, including the famous "Mannheim crescendo".
• Sonata form as the standard first-movement design (see the next screen).

Compare: Baroque terraced dynamics jump in steps; Classical dynamics swell and fade. Hearing a smooth crescendo already rules out a purely Baroque style.

Sonata form in three stages

Sonata form is the great Classical structure. It has three main sections:

• Exposition — a first subject in the tonic key, a bridge (transition) that modulates, then a contrasting second subject in a related key (the dominant, or the relative major if the movement is minor).
• Development — the themes are broken up, combined and pushed through many keys, building tension.
• Recapitulation — both subjects return, but now both in the tonic, often rounded off by a coda.

The four cadences

A cadence is the pair of chords that punctuates the end of a phrase. Learn all four by sound and by chord numbers:

• Perfect — V–I. Sounds finished and conclusive, like a full stop.
• Plagal — IV–I. The gentle "Amen" cadence, also conclusive but softer.
• Imperfect — ends on V (often I–V, ii–V or IV–V). Sounds unfinished, like a comma or question.
• Interrupted — V–vi. A surprise: the ear expects V–I but lands on the minor chord vi instead.

Bonus colour: a tierce de Picardie is a major chord ending a piece that was otherwise in a minor key — a bright final surprise common in Baroque and earlier music.

Question 4 — identify the cadence

Describing texture

Texture is how many layers of sound there are and how they relate. Use the correct term when you appraise:

• Monophonic — a single unaccompanied line (or everyone in unison).
• Homophonic — one clear melody with chordal accompaniment. The Classical default.
• Polyphonic / contrapuntal — two or more independent melodic lines woven together. Common in the Baroque.
• Imitation — one part states an idea and another copies it shortly after; a fugue is a strict imitative form.

Next up: a matching game — pair each device with the right meaning before you move on.

Match each device to its meaning

Tap a term on the left, then its matching meaning on the right.

Romantic orchestral style

The Romantic orchestra is bigger, richer and more expressive. Composers stretch the earlier forms and reach for intense emotion. Listen for:

• Chromaticism — notes from outside the key colouring the melody and harmony, creating longing and instability.
• A huge dynamic range, from the barest whisper to overwhelming climaxes, and expressive rubato (flexible timing).
• A greatly expanded orchestra: more brass and percussion, valved horns and trumpets, and richly divided strings.
• Long, singing melodies and adventurous modulation to distant keys.

Continuity and change: a Romantic concerto still uses the Classical inheritance of sonata design and soloist-versus-orchestra contrast — but drenched in chromatic harmony and a far wider palette of colour.

Sort each feature into its period

Tap a feature, then tap the period it belongs to.

Listening like an examiner

When you appraise an unfamiliar extract from this Area of Study, run a quick mental checklist:

• Dynamics — terraced (steps) suggests Baroque; graduated swells suggest Classical or later.
• Continuo — a chugging harpsichord underneath everything points firmly to the Baroque.
• Harmony — clear tonic-and-dominant simplicity = Classical; heavy chromaticism and remote modulation = Romantic.
• Resources — a small string band = early; prominent trombones, tuba, harp and large percussion = late Romantic.

Always justify. Never just name a period — say why: "Romantic, because of the chromatic harmony, wide dynamic range and expanded brass."

Question 5 — appraise the extract

The big ideas to know

You have covered the style, form, harmony, texture and resources of orchestral music from 1700 to 1900. Press Finish to see your score.