A symphony is an extended musical composition in Western classical music, most often for orchestra. Although the term has had many meanings from its origins in the ancient Greek era, by the late 18th century the word had taken on the meaning common today: a work usually consisting of multiple distinct sections or movements, often four, with the first movement in sonata form. Symphonies are almost always scored for an orchestra consisting of a string section, brass, woodwind, and percussion instruments which altogether number about 30 to 100 musicians. Symphonies are notated in a musical score, which contains all the instrument parts. Orchestral musicians play from parts which contain just the notated music for their own instrument. Some symphonies also contain vocal parts.

Mannheim school refers to both the orchestral techniques pioneered by the court orchestra of the Elector Palatine in Mannheim in the latter half of the 18th century and the group of composers of the early classical period, who composed for the orchestra of Mannheim. The father of the school is considered to be the Bohemian composer Johann Stamitz. Besides him, two generations of composers wrote compositions for the orchestra, whose reputation was due to its excellent discipline and the individual skill of its players; the English traveler Charles Burney called it "an army of generals". Their performance style included new dynamic elements, crescendos and diminuendos. Composers of the Mannheim school played an important role in the development of the classical period's genres and of the classical symphony form.