1) String instrument 
[instrument] The Cuk is a stringed musical instrument from Indonesia. It has 3 strings in 3 courses. It is tuned G4 B3 E3. The strings are made of thick nylon. The instrument evolved from the Portuguese cavaquinho. The body is usually hollowed out of a solid piece of wood. It is mainly used to play Keroncong music along with the Cak. ...