What are the 4 types of musical?

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Formal types

Four basic types of musical forms are distinguished in ethnomusicology: iterative, the same phrase repeated over and over; reverting, with the restatement of a phrase after a contrasting one; strophic, a larger melodic entity repeated over and over to different strophes (stanzas) of a poetic text; and progressive, in which new melodic material is continuously presented (thus synonymous with through-composed). The following discussion deals first with Western and then with non-Western music. Iterative and reverting types Iterative types, not common in Western music, may be found in the recitation tones of Gregorian chant, in which, for example, each line of a psalm is sung to the same melodic formula. Far more common, however, are reverting types. In the Middle Ages there existed the fixed forms used in songs, such as the French ballade (a a b), virelai (A b b a A), and rondeau (A B a A a b A B), the Italian ballata (A b b a A) and the German bar form (a a b), where the patterns of repetition and contrast correspond to poetic forms. (In the representations of the reverting types in songs, lowercase letters refer to the same music set to different words, while capital letters indicate that both text and music are the same.) Since the Baroque period (c. 1600–c. 1750) there has been binary, or two-part form, such as a b. A variety of binary form particularly prominent in the dances of the 18th century is the rounded binary form, the two sections of which are a and b a (i.e., with a final return to original material in the second section), each of which is repeated, part one being heard twice before part two begins: ‖: a :‖ ‖: b a :‖ (‖: and :‖ indicate the enclosed material is to be repeated). Binary The rounded binary form took on great importance in the late 18th century, when it was expanded and elaborated into what is known as sonata form (also called sonata-allegro or first movement form), which may be represented thus: ‖: exposition :‖ ‖: development recapitulation :‖, whereby the kinship to the ‖: a :‖ ‖: b a:‖ structure of rounded binary form is clear. Ordinarily, in the exposition the principal musical themes are stated; in the development they are subjected to a process of working out and variation; and, finally, in the recapitulation they are restated. Sometimes the scheme is enlarged by adding a slow introduction before the exposition or a coda (concluding passage) at the end, or both. This formal principle, usually treated with a certain freedom, has been of basic importance in Western instrumental music since the mid-18th century. Ternary Another basic reverting type is ternary (three-part) form, a b a, also known as “song form” because of its frequent use in that genre, as well as in character pieces for piano. The form dominates the aria in late Baroque opera (the da capo aria, in which the final statement of a is not written out, but the performers simply follow the written instruction da capo, meaning “from the beginning,” and repeat the first part). The da capo principle also appears in the instrumental minuet and scherzo with trio. Rondo On a larger scale are refrain schemes, in which contrasting episodes appear between statements of the refrain. In instrumental music this is found most often in a five-part arrangement, the rondo, frequently a b a c a b a; but many departures from the form occur, most common being the replacement of c by a development passage, usually based on the rondo theme. This important variant, known as the sonata-rondo, is particularly associated with Joseph Haydn. The refrain principle also appears in the rondeau of 18th-century French harpsichord music, in which there is no set limit to the number of episodes. The third movements of concertos, with the reversions of the tutti or ritornello (passage for full orchestra) and the intervening episodes for the solo instrument or instruments, are also of this type, as occasionally are large operatic arias. Strophic types The strophic type is seen in hymns and traditional ballads, in which different poetic strophes are set to the same melody. Thus, while the melody of a single stanza may accord with one of the reverting types, the hymn or ballad as a whole is strophic; this also applies to the fixed forms of medieval music and to many other types of song, simple and complex. The instrumental equivalent of the strophic type is variation (or theme and variation) form, in which a musical theme, often a complete melody with a harmonic accompaniment, is stated and then repeated a number of times, but with variations. A clear example of the relation between variation and strophic form is the chorale-partita of the Baroque era, a keyboard piece based on a hymn, with each varied statement of the hymn tune corresponding to a strophe of the hymn text. But the structure is more common in independent instrumental compositions, often of considerable dimensions (e.g., Beethoven’s Diabelli Variations for piano). In the Baroque a common type was the ostinato, or variations on a ground, in which the composition was built on a recurring melodic or harmonic pattern, generally in the bass, the accompanying parts being varied with each statement of the pattern, as in Bach’s Passacaglia and Fugue in C Minor for organ or his “Chaconne” from the Partita in D Minor for unaccompanied violin. This procedure is also found in early operatic arias in the strophic variation form, in which each statement of the ostinato corresponds to a strophe of the aria’s text. In the 19th century Brahms made impressive use of the ostinato (finales of the Variations on a Theme by Haydn and the Symphony No. 4 in E Minor).

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britannica.com - musical form - Formal types - Encyclopedia Britannica

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