One of the benefits of working out of the 1946 edition of Théo Charlier’s Trente-Six Etudes Transcendantes includes the annotations of supplementary material found at the conclusion of each etude. The study of this supplementary material creates a new dimension of context to the 36 etudes. Charlier’s 32 Etudes de Perfectionnement for trombone and French tuba contains etudes in the style of his 36 etudes for trumpet, but written specifically for low brass instruments. This document has three major goals. The first is to analyze the annotations provided in Trente-Six Etudes Transcendantes in order to see what skill sets are common between the etudes and the cited material. The second is to provide similar supplementary material for 32 Etudes de Perfectionnement to facilitate mastery and more widespread use of these etudes. The third is to list commonly used pieces from the standard euphonium repertoire of solo and excerpt literature that have skill sets in common with the 32 etudes and supplementary material. The overall goal here is for the student to be able to progress his or her skill sets from fundamental preparatory material to the context of the Charlier etude to the standard euphonium literature. This will on a practical level promote mastery over not only Charlier’s sets of 36 and 32 etudes, but also the standard literature for euphonium.