Son is a generic term for the musical family of country music originating in Oriente de Cuba (Eastern Cuba), as well as a style within the family itself.
Punto Guajiro (also called Punto Cubano) is the country music from the Western and Central provinces of Cuba. This style began to become popular around the end of the 18th century, mainly as a social event. Remember that in the east there were changui's, in Havana and Matanzas there were rumba’s. The punto is the same thing, a party in which the music played became a genre.
© 2007 Jon Griffin
During the 19th century different forms for presenting songs appeared in Cuba, all of which were marked with elements that offered national pride. Among them the Cuban lyrical songs were emphasized: Habaneras, boleros and, in a very special place, the trovadoresca (or, troubadour-style) song form.
Changüi was born in Guantanamo Province, Cuba (specifically the Baracoa area) from the style called Nengon.
There are some conflicting answers you will receive when you ask the question, "What is Changüi"? The answer from an ethnomusicology point if view is simple, but like most academic answers, it leaves more questions and sometimes contradicts popular definitions.