The theme of this written work is the analysis of "Sonata op. 109 no. 30 in E major“ by Ludwig van Beethoven. The work is divided into four chapters with subchapters, an introduction, a conclusion, a summary of the key words, literature, and contributions. The introduction provides general information about the composer and the sonata. I promise to give a detailed analysis of this work. The first chapter entitled "ABOUT THE COMPOSER" describes a part of the composer's life, his opus, character, way of playing and his view of music and the world. The second chapter "PIANO SONATAS OF LUDWIG VAN BEETHOVEN" speaks about the division of the composer's piano sonata opus in three periods with the specification of some major sonatas. The third chapter carries the title "GENERAL CHARACTERISTICS OF THE WORK" and speaks entirely of "Sonata op. 109 ": its origin, the importance within the sonata opus, the formal division to movements and certain features compared to some other works. The fourth and most important chapter is "HARMONICAL, FORMAL AND INTERPRETATIVE ANALYSIS OF THE WORK". The chapter is divided into smaller chapters according to movements and subchapters within these movements. Each movement is explained in detail. The conclusion states my vision of the greatness of this composition and several quotes are added to confirm this. Attachments are added at the end with download information.