The document discusses the mouth-organ, a wind instrument used in folk music in Argentina that has individual tabs for each note and is played by blowing into it. It describes the basic parts of a mouth-organ as the comb, sets of tongues, and protective plates. The document also introduces Juan Quintero, a famous Argentine musician and guitarist born in Tucumán who began studying guitar at age 14 and performing in clubs and cultural events, and is now well known in Argentina for his guitar playing.