Sonata for Solo Violin in D major, Opus 115 by Sergei Prokofiev (1891-1953) and Cadenza for Solo Violin by Krzysztof Penderecki (1933-2020) have been rarely performed in concert. These pieces were written in the twentieth century and represent the coexistence of both tradition and modernity. Based on the existing literature and my own analysis, this study is designed to integrate the full knowledge of both works with useful performance suggestions in one description, offering a detailed performance guide for violin students and professionals, and bring these overlooked solo works to light. Backgrounds on the composers and the works are introduced, as well as stylistic characteristics and musical interpretations focused on performance aspects, as these necessary knowledges are integral for an effective performance. Performance suggestions are made for vibrato, articulation, and sound production. In addition, the suggestions on the topics of technical challenges, effective fingerings and bowings are provided as well.