The formulas below tell which notes of the major scale are used to create a chord.

以下的公式告诉我们在大调里的哪一些音符对应哪一个和弦。

youdao

Harmony concerns the building of chord (tones played together) derived from the scale on which the music is based, and it also involves the order in which successions of chords accompany the melody.

构成音乐基础的音阶上的音构成和弦(即若干同时发响的音)，和声与和弦的构成有关，也与伴奏和弦的连接方法及进行规律有关。

youdao

Piano chords are made by combining a series of notes from the major scale in a certain order to create each chord voicing.

钢琴和弦，将一个大调音阶里的音符按照一定的顺序排列组合。

youdao

So we've got a I chord built on the first degree of the scale, a V chord built on the fifth degree of the scale, a IV chord built on the--a IV chord built on the fourth degree, and a VI chord built on the sixth degree.

这样我们就有了建立在第一音级上的I和弦，第五音级上的V和弦，第四音级上的IV和弦，以及第六音级上的VI和弦。

耶鲁公开课 - 聆听音乐课程节选