I am an expert on the harp, a type of plucked musical instrument. There are many types that vary according to locality. In the northeastern region of Thailand The harp may have different names depending on the locality, such as "sung" or "teng" and is similar in appearance to the northern "sung" or is shaped like a guitar but smaller. It is classified as a stringed instrument, generally having 3 strings. In some localities there may be 2 or 4 strings. It is played by strumming with a thin