Editing Trio sonata (section)

===Johann Sebastian Bach===
German composer [[Johann Sebastian Bach]] is another notable composer of the trio sonata, but he was known for shying away from the traditional structure of the sonata. He typically played the three parts with fewer than three instruments. One part could be played by a violin and the other two parts could be played by a keyboard, or all three parts could be played on the organ.{{sfn|Britannica|2007}}

Trio sonatas by Bach include:

* [[Organ Sonatas (Bach)|Trio Sonatas for organ, BWV 525–530]], combining all three parts on one instrument: typically the right hand, left hand and pedals will each take a different part thus creating the same texture as in a trio.{{citation needed|date=February 2020}}
* A further innovation by Bach was the trio sonata involving a concertante (obbligato) right-hand harpsichord part in addition to the bass line, plus one melodic instrument, thus for two players.{{sfn|Breig|1997}} Examples are the [[Six Sonatas for Violin and Harpsichord, BWV 1014–1019]], [[Sonatas for viola da gamba and harpsichord (Bach)|three sonatas for viola da gamba and harpsichord, BWV 1027–1029]], and two sonatas for flute and harpsichord, [[BWV&nbsp;1030]] and [[BWV 1032|1032]]; [[BWV&nbsp;1020]], [[BWV&nbsp;1031]] and [[BWV&nbsp;1033]] are doubtful.{{sfn|Dürr and Kobayashi|1998|loc=420–421 and 466}}
* Trio Sonatas BWV 1036–1040: [[Sonata in G major for two flutes and basso continuo, BWV 1039|BWV 1039]] is a variant version of BWV&nbsp;1027. The attribution of BWV 1036-1038 to Bach is doubtful, but all are typical of baroque chamber music.{{citation needed|date=February 2020}}
* The mid-18th-century manuscript D-B Mus. ms. Bach ''St 345'' contains a Concerto (or: Trio Sonata) in [[C&nbsp;major]] for violin, cello and continuo, arranged from (or: earlier version of) BWV&nbsp;525/1, 1032/2 and 525/3 respectively.{{sfn|Bach (et al.?)|1740–1760}} The 1998 edition of the [[Bach-Werke-Verzeichnis]] lists this version as [[BWV 525a]], and considers the attribution of the arrangement to Bach doubtful.{{sfn|Dürr and Kobayashi|1998|loc=[https://www.bachmidi.info/kbwv-a2.html#p0466 466]}} Based on the [[New Bach Edition]], the [[Bach Digital]] website gives "BWV&nbsp;[[deest (music)|deest]]" instead of the BWV number 525a for this [[chamber music]] version.{{sfn|Hofmann|2006}}