Divertimento for String Orchestra (Bartók) of imitation, fugato, and contains a three voice fugue. Bartók's Divertimento is scored for string orchestra: Violin I, II, Viola, Violoncello, and Double Bass, all of which contain divisi sections. Unlike the majority of orchestral scores, the minimum number of players in each string section is specified: 6 1st Violins, 6 2nd Violins, 4 Violas, 4 Violoncellos, 2 Double Basses. Typically 8 minutes long, the opening movement is presented as a waltz with specific gypsy influences evident melodically, through the use of various modes and non-traditional scales, and rhythmically, through the use of irregularly placed accents and extended syncopated rhythms.
String quintet a double bass, and Mozart's famous "Eine kleine Nachtmusik" may be performed with this instrumentation (the double bass being optional). Alternative additions include clarinet or piano (see clarinet quintet, piano quintet); and other closely related chamber music genres include the string quartet (much more common), the string trio, and the string sextet. A more unusual form of string quintet is the "violin quintet" composed of 3 violins, a viola and a cello (thus a string quartet with an additional violin). The term "string quintet" may refer to a group of five players that performs such works. The ensemble was standard