Mariachi giving them modified shapes and tunings. In addition to instruments, the Spanish introduced the concept of musical groups—which, in the colonial period, generally consisted of two violins, a harp, and various guitars. This grouping gave rise to a number of folk musical styles in Mexico. One of these folk musical styles was the "son". This music featured string instruments. "Son" music divided into various regional varieties—the variety popular in the Jalisco area was called "son jalisciense", whose best known song, also referred to as "the mariachi national anthem," is “La Negra.” Modern mariachi music developed from this "son" style, with
The Marshall Tucker Band into its sound, most frequently blues, country and jazz. The band has also drawn from boogie, psychedelic, R&B,gospel, folk and rock and roll. According to Allmusic's Jeff Tamarkin, Toy Caldwell's guitar playing style was categorized by "flashy, jazzy llicks; the band has also been noted for extensive jamming. The band's eclectic musical style has predominately been categorized as Southern rock. The band's music has also been categorized as blues rock, country rock, jazz rock and as a "proto-jam band". "Billboard" charts have categorized the band as country, blues and adult contemporary. The band's self-titled debut album was categorized as country