Mento is a style of Jamaican folk music that predates and has greatly influenced ska and reggae music. It is a fusion of African rhythmic elements and European elements, which reached peak popularity in the 1940s and 1950s. Mento typically features acoustic instruments, such as acoustic guitar, banjo, hand drums, and the rhumba box — a large mbira in the shape of a box that can be sat on while played. The rhumba box carries the bass part of the music. Mento is often confused with calypso, a musical form from Trinidad and Tobago. Although the two share many similarities, they are separate and distinct musical forms. During the mid-20th century, mento was conflated with calypso, and mento was frequently referred to as calypso, kalypso and mento calypso. Mento singers frequently used calypso songs and techniques. As in calypso, mento uses topical lyrics with a humorous slant, commenting on poverty and other social issues. Sexual innuendo is also common. Mento draws on musical traditions brought by enslaved West Africa people. Enslaved musicians were often required to play music for their masters and often rewarded for such skills. The Africans created a creole music, incorporating such elements of these traditions, including quadrille, into their own folk music. The Jamaican mento style has a long history of conflation with Trinidadian calypso. The lyrics of mento songs often deal with aspects of everyday life in a light-hearted and humorous way. Many comment on poverty, poor housing, and other social issues. Thinly veiled sexual references and innuendo are also common. Mento can be seen as a precursor of some of the movement motifs and themes dealing with such social issues found in modern dancehall. It became more popular in the late 1940s, with mento performances becoming a common aspect of dances, parties and other events in Jamaica. The word mento is of uncertain etymology; it may be from an African language or Cuban Spanish; Rex Nettleford said the term was brought back from Cuba by Jamaicans returning from work there.