Orchestral build is a term used in disco

Disco

Disco is a genre of dance music. Disco acts charted high during the mid-1970s, and the genre's popularity peaked during the late 1970s. It had its roots in clubs that catered to African American, gay, psychedelic, and other communities in New York City and Philadelphia during the late 1960s and...

 music to describe the systematic overlapping of prerecorded elements of the symphony orchestra during an interlude of a song.

On the song's break

Break (music)

In popular music, a break is an instrumental or percussion section or interlude during a song derived from or related to stop-time – being a "break" from the main parts of the song or piece....

, the melody was reintroduced on top of the drum

Drum

The drum is a member of the percussion group of musical instruments, which is technically classified as the membranophones. Drums consist of at least one membrane, called a drumhead or drum skin, that is stretched over a shell and struck, either directly with the player's hands, or with a...

s, timpani

Timpani

Timpani, or kettledrums, are musical instruments in the percussion family. A type of drum, they consist of a skin called a head stretched over a large bowl traditionally made of copper. They are played by striking the head with a specialized drum stick called a timpani stick or timpani mallet...

, and percussions, by sequential highlighting of the various rhythm instruments, such as the bass guitar

Bass guitar

The bass guitar is a stringed instrument played primarily with the fingers or thumb , or by using a pick....

, guitar

Guitar

The guitar is a plucked string instrument, usually played with fingers or a pick. The guitar consists of a body with a rigid neck to which the strings, generally six in number, are attached. Guitars are traditionally constructed of various woods and strung with animal gut or, more recently, with...

, rhythm guitar

Rhythm guitar

Rhythm guitar is a technique and rôle that performs a combination of two functions: to provide all or part of the rhythmic pulse in conjunction with singers or other instruments; and to provide all or part of the harmony, ie. the chords, where a chord is a group of notes played together...

, piano

Piano

The piano is a musical instrument played by means of a keyboard. It is one of the most popular instruments in the world. Widely used in classical and jazz music for solo performances, ensemble use, chamber music and accompaniment, the piano is also very popular as an aid to composing and rehearsal...

, harp

Harp

The harp is a multi-stringed instrument which has the plane of its strings positioned perpendicularly to the soundboard. Organologically, it is in the general category of chordophones and has its own sub category . All harps have a neck, resonator and strings...

, then followed by the woodwinds, then horns

Horn section

In music, a horn section can refer to several groups of musicians. It can refer to the musicians in a symphony orchestra who play the horn . In a British-style brass band it refers to the tenor horn players. In popular music, it can also refer to a small group of wind instrumentalists who augment a...

, then strings, until all were assembled into a harmonious whole.

As the identifying trademark of the disco mix

Disco mix

A disco mix is a method of producing a recording of a song which was used in the 1970s for disco music, a funk/soul-influenced, dance-oriented pop music style. A disco mix uses orchestral build-ups to a full rich sound and then contrasts this full sound with "breaks" in which only percussion plays...

, the orchestral build was implemented after a break in order to accentuate the melodic structure of the composition, and thereby propel dance-floor participants into a natural-high.