The four composers on this recording are Antonio Jose (Spain 1902-1936), Darwin Vargas (Chile 1925-1988), Roberto Sierra (Puerto Rico and United States, born in 1953), and Dušan Bogdanović (Serbia and United States, born in 1955). Each of their works for solo guitar presents a unique character and language. Antonio Jose is one of the greatest Spanish composers of the 20th century, Darwin Vargas is one of the greatest Chilean composers (but his sonata for guitar has not been recorded until now), and Roberto Sierra is an outstanding American-Puerto Rican composer who is recognized for symphonic works. The recording concludes with the third sonata by Dušan Bogdanović, which draws inspiration from musical exoticism such as jazz and Renaissance traditions. The pieces depict different styles, such as impressionism combined with Spanish nationalistic character, Latin-American rhythms seen in Vargas and Sierra, leading to Bogdanovic, whose idiomatic and academic ideas end this CD. This project aims to study these pioneering works and inspire guitarists to perform them. I will study these works movement by movement using musical analysis with numerous musical examples combined with biographical and historical information.