This is a study of choro in São Paulo, with a brief ethnography of seven-string guitarists. Studies of choro have routinely favored Rio de Janeiro, the birthplace of choro. This work focuses on São Paulo because it has a rich choro tradition, as well as an active and creative contemporary choro scene that has frequently been overshadowed by Rio de Janeiro's. There are three main parts to this study. The first part provides background information, including the major guitarists that have contributed to the development of the guitar's role in choro, and brief reviews of the most important literature on the subject of choro. The second part discusses São Paulo, my methodology, and the music scholars that have informed this study. The second part is the analytical base for the study, in which I examine the song, "Sampa" (1978), by Caetano Veloso, and interpret the uses, functions, and concepts of choro, drawing from Alan Merriam. Part II also includes a brief discussion of the resurgence of choro in the 1970s. This work proposes that choro has as its principal functions both musical and social education. The musical education choro provides is aural, notational, historical, and improvisational. The social education choro provides is one of an idealized mythological "racial democracy." The third and final part is a brief ethnography of the contemporary choro scene in São Paulo, with a focus on seven-string guitarists, and a descriptive account for the contextualization of choro. / text

The thesis describes a realization of the automatic self tuning system for sevenstring guitars. There are comparisons of commercial and uncommercial solutions for six-string guitars. There is also evaluation of useful parts for seven-string guitars. Thesis contains a description of a requirements for individual parts and a control software with respect on real guitar properties and used computing algorithm. In the second part of thesis, there is a description of final system design and its realisation including the control software. This is also related with testing of the entire system.