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Otavio Castro's musical history is a result of the development of innovative harmonica techniques, essentially in diatonic harmonica (popularly known as the blues harmonica), where he created the term "chromaticism in diatonic harmonica", a technique that allows all songs to be performed by using only one C-tuned harmonic (do) for all keys.

Born in a musical universe, he is the son of the composer Everardo Castro (founder of the Jazz and Bossa Club in the 60s), disciple of Rodrigo Eberienos and Mauricio Einhorn, and highly influenced by Howard Levy in 1996. In 2000, upon finishing his tour performed in New York, he promptly decided to radicalize a technique in the diatonic harmonica, determined to dedicate himself to the systematization of chromaticism.

Throughout his career he worked with musical icons directly from bossa nova, samba, jazz and more traditional Brazilian music such as Choro, Minas Gerais music and Maranhão music, developing a singular, unparalleled interpretation on the harmonicas positioning in the most diverse musical contexts.

As a teacher, he has had the opportunity to instill knowledge into the graduating class of the new generation of harp players, both in and out of Brazil. In 2009 he was invited to participate in the annual convention of SPAH (Society for the Preservation and Advancement of the Harmonica) located in Sacramento, California. With an array of compositions, he is intensely devoted to the expansion of the diatonic harmonica and using chromatic harmonics to compose exquisite and creative arrangements.