An overture...
it is called the preamble.
the introduction of the declaration of independence is called
The preamble is the introduction at the beginning of a formal document. It usually gives the reasons for the following information.
The first paragraph of the constitution is called the Preamble. The US Constitution preamble is the brief introduction of the purpose and principles of the constitution.
Most frequently the term of a document that defines the role of government and how the government organized is called a constitution.
It is called the Overture, sometimes spelled the Ouverture.
This would be called an Aria. They are commonly found between Recetativo Secco and Accompagnato within operas.
It is called the instrumental.
Usually, operas are performed in opera houses. However, operas are sometimes also performed outdoors in open amphitheatres.
The prelude to a vocal work is typically referred to as an "overture" if it is an orchestral introduction, particularly in operas or larger vocal compositions. In more general terms, it may simply be called an "intro" or "introduction." This section sets the mood and prepares the audience for the vocal performance that follows.
The instrumental is called "Heavenless"
That type of music is called instrumental. An instrumental is when there are no vocals in a song.There are only instruments.
Introduction is called "পরিচিতি" in Bengali.
There is a short instrumental song by Yes called "Cinema"
"Instrumental."
An Instrumental
He composed operas mainly.