This thesis intends to illustrate the music language presented in Jindřich Feld’s compositions for accordion. Jindřich Feld (1925-2007) was a very important Czech composer of the second half of the 20th century. As the best example of this music language, I have chosen his “Concert Piece For Accordion” which is certainly one of the most respected accordion compositions ever written. I have always appreciated the music of Jindřich Feld, which is the reason why I decided to write about him and his composition. In this thesis, I focused mainly on an insight into the form and style of “Concert Piece”. Most of my comments and analyses come from my personal experience and from my perspective as an interpreter. This composition, most likely, has not been performed in Sweden before, or it is not well-know at least. I hope that my thesis will help other accordionists and musicians to understand Feld’s music, and contribute to better and more frequent performances of his accordion music.