Editing String quartet (section)

==Variations of string quartet==
[[File:Casals Forum, Arensky string quartet encore.jpg|upright=1.3|thumb|End of [[Anton Arensky|Arensky]]'s [[String Quartet No. 2 (Arensky)|String Quartet No. 2]] for violin, viola and two cellos, played at the [[Casals Forum]] in 2023]]
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Many other chamber groups can be seen as modifications of the string quartet:
* The [[string quintet]] is a string quartet augmented by a fifth string instrument. [[Mozart]] employed two violas in his string quintets, while Schubert's [[String Quintet (Schubert)|string quintet]] utilized two cellos. [[Luigi Boccherini|Boccherini]] wrote a few quintets with a [[double bass]] as the fifth instrument. Most of Boccherini's string quintets are for two violins, viola, and two cellos. Another composer who wrote a string quintet with two cellos is [[Ethel Smyth]].  
* The [[string trio]] has one violin, a viola, and a cello.
* The [[piano trio]] has a piano, a violin, and a cello.
* The [[piano quintet]] is a string quartet with an added [[piano]].
* The [[piano quartet]] is a string quartet with one of the violins replaced by a piano.
* The [[clarinet quintet]] is a string quartet with an added [[clarinet]], such as those by [[Clarinet Quintet (Mozart)|Mozart]] and [[Clarinet Quintet (Brahms)|Brahms]].
* The [[string sextet]] contains two each of violins, violas, and cellos. Brahms, for example, wrote two string sextets.
Further expansions have also produced works such as the [[Octet (Mendelssohn)|String octet]] by [[Mendelssohn]], consisting of the equivalent of two string quartets. Notably, [[Arnold Schoenberg|Schoenberg]] included a [[soprano]] in the last two movements of his [[String Quartets (Schoenberg)#String Quartet No. 2, op. 10|second string quartet]], composed in 1908. Adding a voice has since been done by [[Milhaud]], [[Ginastera]], [[Brian Ferneyhough|Ferneyhough]], [[Peter Maxwell Davies|Davies]], [[İlhan Mimaroğlu]] and many others. Another variation on the traditional string quartet is the electric string quartet with players performing on [[Electric violin|electric instruments]].