This work includes a theoretical overview of arranging as a separate process that implies the adaptation of certain musical material for a determined composition and arranging as an inseparable process in the course of composing. Understanding the arrangement procedures affects how an arrangement will ultimately look. This is followed by emphasizing the importance of preparation in the work of music pedagogues. Analyzing the arranged and original literature composed for the composition for which it is arranged provides an insight into many situations and solutions in the treatment of musical material of possible situations. The main part of the work is a description of the work process during the preparation and prepared material - Variations on the theme of "Ode to Joy" by Ludwig van Beethoven. With a freer approach to a one-part melody taken from Ludwig van Beethoven's Ninth Symphony, my arrangement for a chamber ensemble was created - a brass quintet in the form of a theme with variations, the development and form of which is also described. The theoretical study of an individual brass instrument, the development of instrumental music in general and the emergence of chamber music preceded the entire process in order to later serve in the adaptation of the musical material to the instruments of the ensemble and be in accordance with their technical, expressive and performing capabilities in the collective, whereby the composer's original must be kept idea.