The banjo is a quintessentially American instrument, but its origins are rooted in West Africa. It was developed by enslaved people in the Caribbean and North America based on African instruments like the 'akonting' or the 'xalam.' These early banjos featured a gourd body and a skin membrane stretched over it, which gave the instrument its percussive, short-sustaining sound. The most distinctive feature of the modern 5-string banjo is the 'drone string' or 'thumb string'—a shorter string that starts halfway up the neck. This string is usually tuned to a high pitch and provides a constant rhythmic drone. In the 19th century, the gourd was replaced by a wooden or metal rim, and the 'tone ring' was added to project the sound even further. This evolution made the banjo loud enough to lead early jazz bands and bluegrass ensembles.