This study aims at investigating to what extent improvisation and oral tradition allowed for the consolidation of ragtime and choro into musical genres which became popular in the turning of the nineteenth century. The choice was concentrated on the formal similarities existing between both kinds of music and in the paths taken by both of them in their process of consolidation. As far as the concepts of territorialization and de-territorialization coined by Gilles Deleuze and Félix Guattari, and incorporated in musical improvisation by Rogério Costa, it was possible to verify the type of improvisation used in these two genres. Historically, it re-states D. Bailey's idea that improvisation is always present in the creation of new notational systems, genres and musical styles, even if it leaves the scene during the transmutation processes. This article derives from the first author's Master of Arts dissertation (IA-UNESP, Brazil).
ragtime; choro; improvisation; Brazilian popular music; North-American popular music
