Which traditional South American instrument is mainly composed of hollow tubes of different lengths?

The Pan flute

The Pan flute, also known as the syrinx, is an ancient instrument made up of a series of tubes of varying lengths, arranged side by side. Each tube produces a different note, allowing the instrument to play complex and harmonious melodies. Although associated with multiple cultures around the world, the Pan flute is particularly emblematic of the South American Andes where it is used in many forms of traditional music, embodying the spirit of the mountainous landscapes and indigenous culture.