The objective of this research was to investigate the effectiveness of the rehearsal plan in the preparation of Brazilian art songs. This disquisition proposes a rehearsal plan model based on the concept of the class plan used in the field of education. The rehearsal plans were applied in a series of rehearsals with two singers at North Dakota State University in which we worked on four art songs composed by the Brazilian composer Francisco Mignone (1897-1986). This qualitative study adopted the autoethnography as research method. In this autoethnographic research I worked both as researcher and as pianist in the rehearsals. This disquisition relied upon two axes of theoretical framework, one musical and one educational: the musical axis was formed of studies regarding performance and preparation of art songs as developed by Katz (2009), Kimball (2006), Stein and Spillman (1996), Moore (1984), Bernac (1978), and Adler (1971). The educational axis was based on the studies of Libâneo (2006) and Coll, Pozo, Sarabia, and Valls (1998) and provided the concept, philosophical basis, structure, and applicability of the class plan. This educational axis also included studies supporting the effectiveness of the rehearsal plan in various musical contexts, such as Gorelick (2001), Brunner (1996), and Figueiredo (1990). The research data revealed that the rehearsal plan was an effective pedagogical tool in the preparation of Brazilian art songs. The rehearsal plans provided outlines of clear objectives and focused rehearsal strategies and facilitated the development and application of specific rehearsal strategies for art song performance preparation. The plans also promoted connectivity between rehearsals and a sense of accomplishment for the pianist and singers. In addition, the rehearsal plans detailed the preparation of Brazilian art songs with respect to three distinct dimensions of knowledge: conceptual, practical, and attitudinal.