Bongos

...A type of percussion instrument that is widely used in Cuban music. It consists of two small drums connected together, each with a wooden body and leather covering only the top (hence the plural bongos). The player sits on a chair, holds the instrument between his knees, and strikes it with his bare hands. The two drums are slightly different in size, and as a rule the smaller one (which is about 4-5 degrees higher in pitch) is placed on the left. By striking the part of the left drum near the edge of the leather strongly with the fingertips of the right hand, a clear, high-pitched sound can be obtained, adding a glamorous effect to the performance. ...

*Some of the terminology that mentions "bongoes" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…キューバ系音楽を中心に広く使用される打楽器の一種。木製の胴に上だけ革を張った小型の太鼓2個が連結されており(そのためボンゴスbongosと複数形で呼ばれる)，奏者は椅子にかけて両ひざの間に楽器を挟み，素手で打つ。2個の太鼓は大きさがやや異なり，小さいほう(4～5度くらい音程が高い)を左にするのが原則で，左側の太鼓の革の縁に近い部分を，右手の指先で強く打つと澄んだ高い音が得られ，演奏に華やかな効果を添えることができる。…

※「bongoes」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報