The bass drum and the tuba or in the marching band, it would be a sousaphone they would call it, the bass drum and tuba.

该是低音鼓和低音号,军乐队中,该是他们所说的苏萨大号,低音鼓和低音号

耶鲁公开课 - 聆听音乐课程节选

Somebody's up there going and it's actually the bass so we'll be wanting to zero in on the bass in a big way in music because that's oftentimes giving us much more information than the melody.

有些人在那唱,事实上那是低音,所以我们在音乐中,主要将注意力集中到低音上,因为大多数情况下,相比旋律而言,低音给我们的信息更多

耶鲁公开课 - 聆听音乐课程节选