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Concept
Bridge (music)
Summary
In music, especially Western popular music, a bridge is a contrasting section that prepares for the return of the original material section. In a piece in which the original material or melody is referred to as the "A" section, the bridge may be the third eight-bar phrase in a thirty-two-bar form (the B in AABA), or may be used more loosely in verse-chorus form, or, in a compound AABA form, used as a contrast to a full AABA section.
The bridge is often used to contrast with and prepare for the return of the verse and the chorus. "The b section of the popular song chorus is often called the bridge or release."
The term comes from a German word for bridge, Steg, used by the Meistersingers of the 15th to the 18th century to describe a transitional section in medieval bar form. The German term became widely known in 1920s Germany through musicologist Alfred Lorenz and his exhaustive studies of Richard Wagner's adaptations of bar form in his popular 19th-century neo-medieval operas. The term entered the English lexicon in the 1930s—translated as bridge—via composers fleeing Nazi Germany who, working in Hollywood and on Broadway, used the term to describe similar transitional sections in the American popular music they were writing.
Bridges are also common in classical music, and are known as a specific Sequence form—also known as transitions. Formally called a bridge-passage, they delineate separate sections of an extended work, or smooth what would otherwise be an abrupt modulation, such as the transition between the two themes of a sonata form. In the latter context, this transition between two musical subjects is often referred to as the "transition theme"; indeed, in later Romantic symphonies such as Dvořák's New World Symphony or César Franck's Symphony in D minor, the transition theme becomes almost a third subject in itself.
The latter work also provides several good examples of a short bridge to smooth a modulation. Instead of simply repeating the whole exposition in the original key, as would be done in a symphony of the classical period, Franck repeats the first subject a minor third higher in F minor.
Official source
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