Sonata in G minor, K.347 (Sonata a Quattro)

As with much of his music, Johann Joseph Flux wrote Sonata in G minor, K. 347 as a means to further the development of the eighteenth-century alto trombone. The reasoning of writing trombone parts is due to the abundance of good trombonists such as Leopold Christian Sr. and his sons. The date of the piece is unknown; however, it is a part of a collection of works compiled for publication in 1717 and 1718. Sonata in G minor is categorized under sonata de chiesa (church sonata) and as with the other sonatas the Organ serves as the continuo instrument. Fux’s Sonata differs from a normal sonata de chiesa because his work only has three movements and the normal amount is four. A fifteen-measure slow introduction begins movement one of the sonata and it is then ended with a perfect authentic cadence with a Picardy third alto trombone ornamentation. The first movement is a triple fugue with an introduction that serves to introduce the first subject. The second and third subjects enter in the allegro, and all three combine to end the movement.  Unlike some thirty-second note passages in the first movement the second consists mostly of half and whole notes. Two brief themes are introduced at the beginning and then developed throughout. The second movement begins in E flat major, moves through c minor, and ends in g minor. After the attacca from movement two to three we end up in a double fugue form which is one less fugue from the first movement. The first subject is stated and developed within nine measures and every entrance after move the tonality through all the keys proposed during the entire piece. Afterward the multitude of key changes we finally end on g minor with a perfect authentic cadence. A thing to remember when looking at all the keys is that in the baroque genre the last flat of the key signature was omitted so even though the sonata is in g minor, it is played as though it is in the key F major or d minor.

Sources:
https://digital.library.unt.edu/ark:/67531/metadc278148/m2/1/high_res_d/1002721165-babcock.pdf
http://imslp.org/wiki/Sonata_in_G_minor,_K.347_(Fux,_Johann_Joseph)
https://www.youtube.com/watch?v=wYmIZBbd3s8