A symphony is an extended musical composition in Western classical music, most often written by composers 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 (violin, viola, cello, and double bass), 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 (e.g., Beethoven's Ninth Symphony). A symphony is an extended musical composition in Western classical music, most often written by composers 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 (violin, viola, cello, and double bass), 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 (e.g., Beethoven's Ninth Symphony). The word symphony is derived from the Greek word συμφωνία (symphonia), meaning 'agreement or concord of sound', 'concert of vocal or instrumental music', from σύμφωνος (symphōnos), 'harmonious'. The word referred to a variety of different concepts before ultimately settling on its current meaning designating a musical form. In late Greek and medieval theory, the word was used for consonance, as opposed to διαφωνία (diaphōnia), which was the word for 'dissonance'. In the Middle Ages and later, the Latin form symphonia was used to describe various instruments, especially those capable of producing more than one sound simultaneously. Isidore of Seville was the first to use the word symphonia as the name of a two-headed drum, and from c. 1155 to 1377 the French form symphonie was the name of the organistrum or hurdy-gurdy. In late medieval England, symphony was used in both of these senses, whereas by the 16th century it was equated with the dulcimer. In German, Symphonie was a generic term for spinets and virginals from the late 16th century to the 18th century. In the sense of 'sounding together,' the word begins to appear in the titles of some works by 16th- and 17th-century composers including Giovanni Gabrieli's Sacrae symphoniae, and Symphoniae sacrae, liber secundus, published in 1597 and 1615, respectively; Adriano Banchieri's Eclesiastiche sinfonie, dette canzoni in aria francese, per sonare, et cantare, op. 16, published in 1607; Lodovico Grossi da Viadana's Sinfonie musicali, op. 18, published in 1610; and Heinrich Schütz's Symphoniae sacrae, op. 6, and Symphoniarum sacrarum secunda pars, op. 10, published in 1629 and 1647, respectively. Except for Viadana's collection, which contained purely instrumental and secular music, these were all collections of sacred vocal works, some with instrumental accompaniment. In the 17th century, for most of the Baroque period, the terms symphony and sinfonia were used for a range of different compositions, including instrumental pieces used in operas, sonatas and concertos—usually part of a larger work. The opera sinfonia, or Italian overture had, by the 18th century, a standard structure of three contrasting movements: fast, slow, fast and dance-like. It is this form that is often considered as the direct forerunner of the orchestral symphony. The terms 'overture', 'symphony' and 'sinfonia' were widely regarded as interchangeable for much of the 18th century. In the 17th century, pieces scored for large instrumental ensemble did not precisely designate which instruments were to play which parts, as is the practice from the 19th century to the current period. When composers from the 17th century wrote pieces, they expected that these works would be performed by whatever group of musicians were available. To give one example, whereas the bassline in a 19th-century work is scored for cellos, double basses and other specific instruments, in a 17th-century work, a basso continuo part for a sinfonia would not specify which instruments would play the part. A performance of the piece might be done with a basso continuo group as small as a single cello and harpsichord. However, if a bigger budget was available for a performance and a larger sound was required, a basso continuo group might include multiple chord-playing instruments (harpsichord, lute, etc.) and a range of bass instruments, including cello, double bass, bass viol or even a serpent, an early bass woodwind instrument. LaRue, Bonds, Walsh, and Wilson write in the second edition of The New Grove Dictionary of Music and Musicians that 'the symphony was cultivated with extraordinary intensity' in the 18th century. It played a role in many areas of public life, including church services, but a particularly strong area of support for symphonic performances was the aristocracy. In Vienna, perhaps the most important location in Europe for the composition of symphonies, 'literally hundreds of noble families supported musical establishments, generally dividing their time between Vienna and their ancestral estate '. Since the normal size of the orchestra at the time was quite small, many of these courtly establishments were capable of performing symphonies. The young Joseph Haydn, taking up his first job as a music director in 1757 for the Morzin family, found that when the Morzin household was in Vienna, his own orchestra was only part of a lively and competitive musical scene, with multiple aristocrats sponsoring concerts with their own ensembles. LaRue, Bonds, Walsh, and Wilson's article traces the gradual expansion of the symphonic orchestra through the 18th century. At first, symphonies were string symphonies, written in just four parts: first violin, second violin, viola, and bass (the bass line was taken by cello(s), double bass(es) playing the part an octave below, and perhaps also a bassoon). Occasionally the early symphonists even dispensed with the viola part, thus creating three-part symphonies. A basso continuo part including a bassoon together with a harpsichord or other chording instrument was also possible. The first additions to this simple ensemble were a pair of horns, occasionally a pair of oboes, and then both horns and oboes together. Over the century, other instruments were added to the classical orchestra: flutes (sometimes replacing the oboes), separate parts for bassoons, clarinets, and trumpets and timpani. Works varied in their scoring concerning which of these additional instruments were to appear. The full-scale classical orchestra, deployed at the end of the century for the largest-scale symphonies, has the standard string ensemble mentioned above, pairs of winds (flutes, oboes, clarinets, bassoons), a pair of horns, and timpani. A keyboard continuo instrument (harpsichord or piano) remained an option.