Final answer:
The gan gan, an hourglass pressure drum, is most commonly associated with the Yoruba people and their music culture, which uses the instrument for both musical and communicative purposes in Nigeria and neighboring regions.
Step-by-step explanation:
The hourglass pressure drum, known as gan gan, is a common solo instrument heard in Yoruba music. The Yoruba people are an ethnic group from Nigeria and the surrounding regions, and their music is recognized for its intensity and deeply cultural rhythms. The gan gan is particularly important because of its ability to mimic the tonalities and rhythms of the Yoruba language, making it not only a musical instrument but also a communicative device within their oral tradition.
This type of drum is also found in other West African cultures and is played by squeezing the laces that join the two halves of the drum, varying the tension and hence the pitch. When we look at the spread of musical instruments and influence, it's also interesting to note that the Dong Son culture was known for its bronze drums that spread widely across Southeast Asia.