1) String instrument 
[instrument] The Cak is a stringed musical instrument from Indonesia. It has 4 strings in 3 courses. It is tuned D5 D5, G4, B4. The strings are made of steel. The instrument evolved from a small banjo, but now has a wooden front and a guitar shaped body. The body is usually hollowed out of a solid piece of wood. The soundboard has lots of l...