According to the Internet source given below, Johann Gottlieb Janitsch was a German Baroque composer was born in Schweidnitz, Silesia (today Swidnica, Poland).
He studied in Breslau (today Wroclaw) with the Court musicians employed by the Archbishop of Breslau. In 1729 his father sent him to Frankfurt an der Oder, where he studied law at the University of Frankfurt an der Oder until 1733.
In 1733 Janitsch moved to Berlin to for three years as secretary to the Prussian state and war minister Franz Wilhelm von Happe. In 1736, the then Crown Prince, Frederick offered him a position as a "Contraviolinist" in his ensemble in Ruppin and a year later, in Rheinsberg. During his time in Rheinsberg he founded the circle Freitagsakademien (Friday academies), in which music was performed by professional and amateur musicians alike.
Janitsch's compositional style is typical of the galant and the empfindsamer Stil of the first half of the 18th century. Although several of Janitsch's works were already published by the Breitkopf during his lifetime, most of his surviving output exists in manuscript form.

Websites:
	Johann Gottlieb Janitsch	Biography by wikipedia.org.

Recorder Sheet Music

Quadro F-Dur (Oboe/A(Flute)/Violin/BC) Score. 28 pages. Arr./Editor: Klaus Hofmann Part: Violin - Part: Violoncello/Contrabass - Part: Recorder - Part: Oboe - Set of parts - Publisher: Carus Verlag (4050400)

Sonata in F major (A/Violin/BC) Score. 20 pages. . For Recorder f1, Violin, Basso continuo. Arr./Editor: Klaus Hofmann Part: Violin. - Part: Violoncello. - Part: Recorder - Publisher: Carus Verlag (1122000)