335 Selected Melodious Progressive and Technical Studies for French Horn edited by Max Pottag and Albert Andraud has been a staple of the horn repertoire for years. This primer is great for any performer - regardless of age!
Pat Stuckemeyer says, "This book is a great find. Not only does it have some of my favorite repertoire for the horn, but also includes some great new exercises. While these pieces are in F-transposition, I find that simply reading them in either Bb-treble or bass is a great workout for any trumpet, trombone or euphonium player!"