A 15th and 16th century form of Spanish poetry that was often set to music. The early villancico were unique to Spain (known as Iberia at the time). By the middle of the fifteenth century, the textual and musicalform was well defined and was similar to the Italian frottola. It was very popular during the Baroque period and unlike the frottola which virtually disappeared by the middle of the sixteenth century, the villancico continued to be popular through the early part of the seventeenth century. The villancico also became popular in areas colonized by the Spanish, specifically Mexico and Guatemala. The subject matter was generally rustic and pastoral themes.