The String Quintet No. 1 in B flat major

B flat major

B major or B-flat major is a major scale based on B-flat, consisting of the pitches B, C, D, E, F, G, and A. Its key signature has two flats, B/E .Its relative minor is G minor, and its parallel minor is B minor....

, K.

Köchel-Verzeichnis

The Köchel-Verzeichnis is a complete, chronological catalogue of compositions by Wolfgang Amadeus Mozart which was originally created by Ludwig von Köchel. It is abbreviated K or KV. For example, Mozart's Requiem in D minor was, according to Köchel's counting, the 626th piece Mozart composed....

 174, was written by Wolfgang Amadeus Mozart

Wolfgang Amadeus Mozart

Wolfgang Amadeus Mozart , baptismal name Johannes Chrysostomus Wolfgangus Theophilus Mozart , was a prolific and influential composer of the Classical era. He composed over 600 works, many acknowledged as pinnacles of symphonic, concertante, chamber, piano, operatic, and choral music...

 in December 1773. Like all of Mozart's string quintet

String quintet

A string quintet is a musical composition for a standard string quartet supplemented by a fifth string instrument, usually a second viola or a second cello , but occasionally a double bass. Wolfgang Amadeus Mozart, who favoured addition of a viola, is considered a pioneer of the form...

s, it is a "viola quintet" in that it is scored for string quartet

String quartet

A string quartet is a musical ensemble of four string players – usually two violin players, a violist and a cellist – or a piece written to be performed by such a group...

 and an extra viola

Viola

The viola is a bowed string instrument. It is the middle voice of the violin family, between the violin and the cello.- Form :The viola is similar in material and construction to the violin. A full-size viola's body is between and longer than the body of a full-size violin , with an average...

 (two violin

Violin

The violin is a string instrument, usually with four strings tuned in perfect fifths. It is the smallest, highest-pitched member of the violin family of string instruments, which includes the viola and cello....

s, two violas and cello

Cello

The cello is a bowed string instrument with four strings tuned in perfect fifths. It is a member of the violin family of musical instruments, which also includes the violin, viola, and double bass. Old forms of the instrument in the Baroque era are baryton and viol .A person who plays a cello is...

).

Mozart composed this quintet a few months following the composition of the Viennese Quartets, K. 168-173

Viennese Quartets (Mozart)

The six string quartets, K. 168-173, were composed by Wolfgang Amadeus Mozart in late 1773 in Vienna. These are popularly known as the Viennese Quartets....

 - indeed this work immediately followed that set in the Köchel catalogue.

Movements

The work is in standard four movement

Movement (music)

A movement is a self-contained part of a musical composition or musical form. While individual or selected movements from a composition are sometimes performed separately, a performance of the complete work requires all the movements to be performed in succession...

 form:

• I. Allegro moderato
• II. Adagio
• III. Menuetto ma Allegretto
  Minuet
  A minuet, also spelled menuet, is a social dance of French origin for two people, usually in 3/4 time. The word was adapted from Italian minuetto and French menuet, and may have been from French menu meaning slender, small, referring to the very small steps, or from the early 17th-century popular...
  
  
• IV. Allegro