主しゅ音おん

noun

tonic; keynote

In music theory, the first note of a scale, which serves as the tonal center.

• ハ長ちょう調ちょうの主しゅ音おんはドです。

  The tonic of C major is C.

• 曲きょくの最さい後ごは主しゅ音おんで終おわることが多おおい。

  A piece often ends on the tonic.