Carlos Guido y Spano (1898–1970) was an influential Argentine composer, conductor, and pianist known primarily for his contributions to the genres of classical music and popular Argentine music, including folk and tango. He was particularly recognized for his work in the early to mid-20th century, a period during which he sought to blend traditional Argentine sounds with classical music structures. Notable works include his compositions for piano and orchestral pieces, as well as arrangements of traditional folk songs. His arrangements of popular Argentine folk music helped elevate the genre and bring it into concert halls, thus broadening its appeal. Guido y Spano was also instrumental in promoting the music of other Argentine composers, fostering a sense of national identity through music. His educational efforts and performances contributed to a growing appreciation for Argentine cultural heritage during a time of significant social change. His impact on music can be seen in the way he bridged classical and popular music, influencing future generations of musicians and composers in Argentina and beyond. His legacy remains significant in the context of Argentine music history.