It is said that in previous times in the southern east Asia area (Vietnam and others, but unknown now), bronze drums were usually buried and, picked up and used in the case of ceremonies and funerals.
かつての東南アジア方面（ベトナム等、しかし現在は不明）の銅鼓も日ごろ地中に埋めてあり、祭りの時や葬儀の時取り出して使用していたという。