Answer:
all correct
Explanation:
1.Nowadays, the most common materials used are woods and metals. Historically, wood, bone, animal hides, and reeds have been popular choices for musical instruments. The oldest device ever found that historians agree is a musical instrument is a flute that's about 67,000 years .
2.An instrument creates sound when part of it vibrates rapidly. The column of air inside a wind instrument, the string of a string instrument, or the stretched skin of a drum all vibrate when played. This vibration produces sound waves in the air, which we hear as musical notes.
3.The instruments of a gamelan are tuned to each other and not to a standard pitch. Musicians play simultaneous variations of a melodic line, creating a shimmering, pulsating sound. ... The main, or skeletal, melody, called balungan, is generally played by instruments made up of tuned metal bars
