a short melody in the bass that is constantly repeated
例句与用法
1.
A modern orchestra usually employs 4 timpani of different sizes and pitches . besides enhancing the rhythm of an orchestral work , the timpani are also effective as a ground bass 定音鼓不但用以加强乐曲的节奏效果，同时又可以保持和声的根音，甚至可以奏出简单的旋律。
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