Book of solo piano etudes by Brazilian composer Bruno Ruviaro. The title comes from a Brazilian poem by Augusto de Campos (Pos-tudo). An etude ("study" in French, "estudo" in Portuguese) is typically a short musical composition designed to improve the skills of a performer by isolating and exploring a specific technical and musical challenge. Each of these twelve etudes is made up of transformations of existing music by other composers, from Bach to Tom Jobim, from Chopin to Pixinguinha, from Kagel to Chiquinha Gonzaga. A PDF of this work can be accessed directly from the composers' website. Bruno Ruviaro lives in Oakland, California, and teaches Composition and Electronic Music at Santa Clara University.