Here is transcriptions and original works published by Klarthe.
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Sheet music
1st Symphony (extract), Trumpet Tune - Johannes Brahms and Henry Purcell
For trumpet trio
arrangement by Luc Rousselle
21 duets for cornets (or trumpets) - W.A. Mozart
From The Magic Flute and 12 duets for 2 french horns K.487
arrangement by Luc Rousselle and André Feydy
Belle qui tiens ma vie - Thoinot Arbeau
Arrangement for Symphonic Orchestra and Choir: Jean-Jacques Charles
Belle qui tiens ma vie - Thoinot Arbeau
Arrangement for Wind Orchestra and Choir: Jean-Jacques Charles