The plena was a result of the mixing of the culturally diverse popular class, where their workplace, neighborhood, and life experiences met to create an expressive,
satirical style of music. It became a way for the working class to gain empowerment through
parody. Due to originating in the lower social class, it was regarded by the upper class as "a menace to public order and
private property" and was for many years associated with people of
la vida alegre (the merry life), referring to prostitutes, dancers, alcoholics, and moral degenerates. Singing and dancing of the plena often happened in
cafetines, bars that frequently doubled as brothels and where interracial socializing and sexual encounters were free to take place. According to singers discussing the use of the plena, they stated it was song with lyrics that related to a current event. For example, if someone drowned or was killed, a plena would be written about it. , , , and were some plenas which became wildly popular. The eventual widespread acceptance of the plena can be attributed to the increased number of people joining the
workforce, which led to a new demand for public leisure. It was still considered indecent by the upper class, who fought against its rising popularity. In December 1917, an ordinance was passed banning the dances from happening inside the city limits. It took another decade for the plena to gain widespread popularity throughout Puerto Rico and cross
racial and
cultural boundaries. Listening to plena at home and at neighborhood- or municipal-sanctioned celebrations became acceptable and was no longer considered morally tainted by "respectable" white upper class
Ponceños. Eventually, with much whitewashing to make it more palatable to the masses, plena was embraced in earnest as a style of music that united Puerto Ricans. However, with the acceptance of the upper class, what began as a vitally important cultural identifier and personal expression of philosophy, community, and self to the lower class became an entertaining spectacle for the white upper class. By the 1930s, the plena was accessible to all through the
radio and
record industries. ==Genre==