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Recommended brass repair shops:
1.
I start every young student with the Rubank Books.
I like them because they have a variety of duets, solos, etudes, technique, standard repertoire introductions and more!
Purchase them here:
Elementary Method
Intermediate Method
2.
Kling, Henri. Hornschule.
Not a book I use, but it is still worth noting because it is exhaustive study of horn technique, starting with natural horn harmonics.
Available at:
https://ks.imslp.net/files/imglnks/usimg/5/56/IMSLP23955-PMLP54437-Kling_Horn_Schule.pdf
3.
Kopprasch. Sixty Selected Studies for French Horn. revised by Gumbert[sic], Friederich and Albin Frehse. (New York: Carl Fischer, 1939) Available at:
https://ks.imslp.net/files/imglnks/usimg/6/6a/IMSLP239696-PMLP30686-Kopprasch_60_Selected_Studies.pdf
Purchase it here:
https://www.sheetmusicplus.com/title/60-studies-volume-i-sheet-music/4311272
Every new teacher I ever had started me with Kopprasch etude 1. You will not escape these essentials! ;)
4.
Alphonse, Maxime. Deux cents Études Nouvelles Mélodiques et Progressives pour cor. 6 volumes (Paris: Alphonse Leduc, 1924)
Available at IMSLP, for free OOR
Better yet, purchase the books here, and support published music!
Maxime-Alphonse presents a more lyrical approach to etudes, so they are well suited for minutiae of musical phrasing as well as technical demands of the instrument.
5.
Gallay, J. F. 12 Études for Second Horn, op. 57. (San Antonio: Southern Music Company, 1980)
http://imslp.org/wiki/Category:Gallay,_Jacques_Fran%C3%A7ois
The above link is the link to the GALLAY section of imslp.org and contains all his horn compositions! Even a Concerto I never knew about! Gallay's work is the heavy metal of horn etudes - the non-measured preludes are beastly difficult.
Etudes, Brutus
The Art of French Horn Playing
by Phillip Farkas
This book is an exhaustive dictionary of the how to's of Horn playing.
I refer to it constantly!