This is what we found on Wikipedia regarding the Bachata Class:

Bachata is a genre of music that evolved in the Dominican Republic in the 20th century. It contains elements of European (mainly Spanish music), indigenous Taino and African musical elements, representing the cultural diversity of the Dominican population. A form of dance, bachata, also developed with the music.

In the 1990s bachata's instrumentation changed from the nylon string Spanish guitar and maracas of traditional bachata to the electric steel string and guira of modern bachata. Bachata further transformed in the 21st century with the creation of urban bachata styles by bands such as Monchy y Alexandra and Aventura. These new modern styles of bachata became an international phenomenon, and today bachata is one of the most popular styles of Latin music.

The original term used to name the genre was amargue ("bitterness", "bitter music"), until the mood-neutral term bachata became popular. The genre mixed these and the troubadour singing tradition common in Latin America (and later, from the mid-1980s, merengue). The first recognised bachata recorded was composed by José Manuel Calderón in 1962 ("Borracho de amor").

"It has been compared to the blues in the past in terms of, structurally, the kind of folks who were making it, people on the margins of society. It's a little more cheerful, though, than the blues. Even songs where they're singing about the treachery of a woman ... if you just listen to them musically, they still sound kind of sweet."