The process of memorization of musical pieces and performing without the support of sheet music is often described as ”playing a piece by heart.” This thesis delves into the process of memorization in classical music, with a particular focus on the author's personal journey in practicing the Kodaly’s solo cello sonata, highlighting the utilization of four distinct memory styles: kinesthetic, aural, visual, and analytical memory. Through an examination of each memory style, this study unravels the multifaceted nature of memorization in musical performance. The thesis not only explores the individual contributions of these memory styles but also examines how to combine them during the learning and memorization process. Through examples, the author sheds light on how she integrated these memory styles, achieving a comprehensive understanding of the piece and ultimately being able to perform it by heart. The findings of this study contribute to the broader field of music cognition, providing valuable insights into the mechanisms involved in memorization and performance. It highlights the importance of considering diverse memory styles and their integration in learning effective memorization techniques in classical music. This study can be useful for musicians who want to develop their memorization process and have a good experience from learning and performing pieces by heart.