French horn in the context of "Countermelody"

An orchestra (/ˈɔːrkɪstrə/ ; OR-ki-strə) is a large instrumental ensemble typical of classical music, which combines instruments from different families. There are typically four main sections of instruments:

• The string section, including the violin, viola, cello, and double bass
• The woodwind section, including the flute, oboe, clarinet, bassoon, and occasionally saxophone
• The brass section, including the French horn (commonly known as the "horn"), trumpet, trombone, cornet, and tuba, and sometimes euphonium
• The percussion section, including the timpani, snare drum, bass drum, cymbals, triangle, tambourine, tam-tam and mallet percussion instruments

Other instruments such as the piano, harpsichord, pipe organ, and celesta may sometimes appear in a fifth keyboard section or may stand alone as soloist instruments, as may the concert harp and, for performances of some modern compositions, electronic instruments, and guitars.

A wind quintet, also known as a woodwind quintet, is a group of five wind players (most commonly flute, oboe, clarinet, French horn and bassoon).

Unlike the string quartet (of 4 string instruments) with its homogeneous blend of sound color, the instruments in a wind quintet differ from each other considerably in technique, idiom, and timbre. The modern wind quintet sprang from the octet ensemble favored in the court of Joseph II in late 18th century Vienna: two oboes, two clarinets, two (natural) horns, and two bassoons. The influence of Haydn's chamber writing suggested similar possibilities for winds, and advances in the building of these instruments in that period made them more useful in small ensemble settings, leading composers to attempt smaller combinations.

A horn section is a group of musicians playing horns. In an orchestra or concert band, it refers to the musicians who play the "French" horn, and in a British-style brass band it is the tenor horn players. In many popular music genres, the term is applied loosely to any group of woodwind or brass instruments, or a combination of woodwinds and brass.

The natural horn is a musical instrument that is the predecessor to the modern-day (French) horn (differentiated by its lack of valves). Throughout the seventeenth and eighteenth centuries, the natural horn evolved as a separation from the trumpet by widening of the bell and lengthening of the tubes. It consists of a mouthpiece, long coiled tubing, and a large flared bell. This instrument was used extensively until the emergence of the valved horn in the early 19th century.

Baroque pop (sometimes called baroque rock) is a fusion genre that combines rock music with particular elements of classical music. It emerged in the mid-1960s as artists pursued a majestic, orchestral sound and is identifiable for its appropriation of Baroque compositional styles (contrapuntal melodies and functional harmony patterns) and dramatic or melancholic gestures. Harpsichords figure prominently, while oboes, French horns, and string quartets are also common.

Although harpsichords had been deployed for a number of pop hits since the 1940s, some record producers in the 1960s increasingly placed the instrument in the foreground of their arrangements. Inspired partly by the Beatles' song "In My Life" (1965), various groups were incorporating baroque and classical instrumentation by early 1966. The term "baroque rock" was coined in promotional material for the Left Banke, who used harpsichords and violins in their arrangements and whose 1966 song "Walk Away Renée" exemplified the style.