(Jose Antonio) Carlos de Seixas (1704-1742) is an important figure in the European keyboard music of the beginning of the 18th-century. His keyboard sonatas demonstrate a high execution level that can be compared with J. P. Rameau, J. S. Bach, Domenico Scarlatti, Padre Antonio Soler and other important composers of his time. This book will discuss the sources for Seixas scholarship followed by a historical overview of seventeenth- and eighteenth- century Portugal as well as a brief biographical sketch of Seixas’s life. This book includes a discussion of Seixas’s musical style and form—including specific approaches to ornaments, articulation, improvisation, rubato, and the like—. The author examines various facets of his compositional style, including some commonalities found in many composers’ works during the transitional period between the Baroque and pre-Classical. Furthermore, this work examines in greater detail Seixas’s keyboard writing and gives elements for the analysis of Seixas’s sonatas. In addition, this book includes pedagogical insights from an analytical standpoint and annotations for the use of Seixas’s sonatas as teaching resources.