Often a musical form becomes so popular with composers that it is given a name. For example, a symphony is a musical form, so knowing that a piece of music is called a symphony will lead you to expect certain things about it.
Please note that there is some confusion about this: a symphony is not a large group of people who often play classical music together; that is an orchestra. The confusion occurs because many orchestras call themselves "symphony orchestras" because they spend so much time playing symphonies.
If a piece of music is called a symphony, you might expect, for example, that it will be played by a fairly large group of instrumental musicians, with no singers. You'd also expect three or four (depending on when it was written) main sections, called
movements. You'd expect a moment of silence in between movements, and you would expect each movement to sound very different; for example if the first movement is fast and loud, you might expect that the second movement would be slow and quiet. If you have heard many symphonies, you also would not be at all surprised if the first movement is in concerto form and the third movement some sort of dance form.
But it is important to remember that forms are not sets of rules that composers have to follow. Some symphonies don't have silence between movements, and Beethoven added singers to his Ninth Symphony. After all, in architecture, "house" form suggests to most Americans a front and back door, a dining room off the kitchen, and bedrooms with closets, but an architect is free to leave out the dining room, and put the main door at the side of the house and the closets in the bathrooms. Whether a piece of music is concerto form or march form, a theme and variations, or a toccata and fugue, the composer is always free to experiment with the overall architecture of the piece.
Being able to spot that overall architecture as we listen - knowing, so to speak, which room we are in right now - gives us important clues that help us understand and appreciate the music.
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Concerto
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Sonata
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Theme and Variations
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Rondo
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Minuet
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March
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Sarabande
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Gigue