Calypso began in the 17th century when West African slaves in Trinidad and Tobago used the style to mock their slave masters and communicate. It was originally spoken in French Creole but later switched to English. Calypso grew popular during Carnival celebrations, where slaves would hold their own festivities called Canboulay. At these events, calypso music was played and the steel pan instrument was developed from oil drums. Calypso evolved into soca music in the late 20th century, fusing calypso with Indian influences to bring different ethnic groups together. Soca now dominates Trinidad's music scene and annual Carnival celebrations.