An Introduction to Arban's Complete Conservatory Method (O21) This introduction to the famous Arban method for Trumpet (O21) is designed for young french horn players. The Arban techniques for brass playing are as valid for French Horn as for the other brass instruments, and O21 is often used as a primary method by horn players. This book provides starting players with exercises, some in the original form and some carefully tailored to the abilities of beginners, that will prepare them for the more rigorous training offered by the Complete Conservatory Method. My First Arban is an invaluable tool for taking young horn players to the next level of playing achievement.