Madeira all points of interest on the islands. Funchal has an extensive public transportation system. Bus companies, including Horários do Funchal which has been operating for over a hundred years, have regularly scheduled routes to all points of interest on the island. Folklore music in Madeira is widespread and mainly uses local musical instruments such as the machete, rajao, brinquinho and cavaquinho, which are used in traditional folkloric dances like the "bailinho da Madeira". Emigrants from Madeira also influenced the creation of new musical instruments. In the 1880s, the ukulele was created, based on two small guitar-like instruments of Madeiran origin,
Madeira over 6,000 "arrobas" (an "arroba" was equal to 11 to 12 kilograms) by 1455, using advisers from Sicily and financed by Genoese capital. (Genoa acted as an integral part of the island economy until the 17th century.) The accessibility of Madeira attracted Genoese and Flemish traders, who were keen to bypass Venetian monopolies. Sugarcane production was the primary engine of the island's economy, increasing the demand for labour. African slaves were used during portions of the island's history to cultivate sugar cane, and the proportion of imported slaves reached 10% of the total population of Madeira by the 16th century.