African folklor : The morna music:

The morna (pronunciation in both Portuguese and Cape Verdean Creole: [ˈmɔɾnɐ]) is a genre of Cape Verdean music, related to Portuguese fado, Brazilian modinha, Argentinian tango, and Angolan lament, the rumba for Cuba.

Lyrics are usually in Cape Verdean Creole, and instrumentation often includes cavaquinho, clarinet, accordion, violin, piano, and guitar. Morna is often compared to the blues there is little research on the relationship between the genres, though there are interesting similarities and significant cultural connections between Cape Verde and the United States[citation needed].

The best internationally known morna singer is Cesária Évora. Morna and other genres of Cape Verdean music are also played in Cape Verdean immigrant communities abroad, especially in New England in the US, Portugal, the Netherlands, France, West Africa, and parts of Latin America.

Instrumentation

The main instrument associated with the morna is the guitar, popularly called “violão” in Cape Verde. In its most simple form, a guitar is enough to provide the accompaniment for another soloist instrument that can be another guitar, a violin (popularly called “rabeca” in Cape Verde), the singer’s voice or any other melodic instrument. The specific way of strumming the strings in a guitar is popularly called “mãozada” in Cape Verde. The strumming of the morna articulates a bass (played with the thumb, marking the accentuation of the rhythm) with chords (played with the other fingers, either in an arpeggio, either rhythmically, either in a combination of both). The morna can also be performed on a piano, with the left hand providing the bass and the accompaniment and the right hand providing the accompaniment and the melody.
The composition of band for playing a morna is not rigid. A medium-sized band may have (besides the aforementioned guitar) a cavaquinho (that plays the chords rhythmically), a ten or twelve string guitar (popularly called “viola” in Cape Verde, that provides an harmonic support), a soloist instrument besides the singer’s voice and some percussion instrument. A bigger band may have another guitar, an acoustic bass guitar, more than one soloist instrument (violin, clarinet, trumpet, etc.) and several percussion instruments (shaker, güiro, bongos, etc.).

Source : wikipedia