In this essay I describe the similarities and differences between my main instrument, trombone, and my secondary instrument, baritone horn. The question I asked myself in the beginning wasdealing with what effects these instruments may or may not have onmyself in an improvisational context.In order to bring the project to a practical and musical setting aconcert was to be held. Because of this a lot of time was spent composing music with the two instruments in mind. Different ways of composing used aredescribed later in the essay.For example,only using pen and paper as well as the computer program Sibelius.The compositions were also divided between the two instruments. Some tunes were using trombone and others baritone horn. The reasoning behind this is also elaborated on. In order to make the comparison as fair as possible a lot of time was spent practicing thesecondary instrument. This was because of the needto eliminate the element offaultytechnique as much as possible.The last part of the essay reflectsupon different aspects that could have been improved.Such as planning the rehearsals, which got prioritized pretty late in the process and ended up leavingless combined rehearsaltimethan what was initiallyplanned. There isalsoa return to the question asked in the beginning.Explainingwhat differences and similarities wasfound. Also discussingthe effects that the different instruments had when playing themand why that may be. These effects revolved partly around sound quality but also how theimprovisational ways slightly changed between the instruments.