In the time of Praetorius, the cornettino seems to have sometimes been used in sacred vocal music to play in unison with voices (esp. tenors) an octave higher.
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Some composers who specified the use of the cornettino in their scores include: Michael Praetorius, Heinrich Schütz, Johann Heinrich Schmelzer, Heinrich Ignaz Franz von Biber, Matthias Weckmann, Antonio Bertali, Johann Caspar Horn, Johann Erasmus Kindermann, Matthias Spiegler, Johann Vierdanck, Johann Sebastian Bach and Georg Philipp Telemann.