Icaros, the sacred songs of the Amazonian shamans, are traditionally sung either unaccompanied or with the rhythmic shaking of the shacapa, the leaf-bundle rattle. Recently, however, there has been some experimentation with additional instrumentation. Don Agustin Rivas Vasquez, for example, sings his icaros using a variety of drums, pan pipes, maracas, a harmonica, and a stringed instrument of his own devising, as well as a variety of singing styles, some sounding very much like Peruvian popular music.
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