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By the early 18th century an aria was a song in three sections, of which the third repeated the first, while the second introduced variety of subject matter, key, and mood. This is known more exactly as the da capo aria.
After Handel's death (1759) and Mozart's youth (1760s) less rigid forms developed, sometimes based on sonata form (Mozart), and later shaped by the dramatic action of an opera (Beethoven,Weber) or oratorio (Mendelssohn).
Green and red replaced blue and white as the national colours in 1910. The armillary sphere surrounds the shield of Portugal. Effective date: 30 June 1911.
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