The country that a gamelan orchestra is most commonly found in is Indonesia. The orchestra is made up for the most part of percussion instruments.
The janggu and buk are the common drum instruments found in the song. The gayageum is the common string instrument used. The piri is the common woodwind used. See the related link for further descriptions of each instrument.
In a full orchestra, various band instruments are added to the string ensemble. The least common woodwind instrument in a full orchestra is the saxophone.
You do not usually find a guitar in an orchestra. A banjo is not normally found either. Though for special scores they will be added. Eric Copeland's Western Suite includes a part for a six string banjo.
The violin is what is called a stringed instrument, and it is found in the string section of an orchestra.
aulos. Also, a more modern instrument usually discluded from standard orchestras would be the saxophone.
Guitars, stars, and basically all except the violin family and the harp.
The violin is the stringed instrument with the highest pitch. The viola is slightly lower, and it is followed by the cello, and then finally the double bass. The double bass is the lowest string instrument found in an orchestra.
Usually 12, when using a full 60-piece string section.