A secondary dominant chord is an altered chord (has at least one accidental) that has a dominant relationship to another chord that is not the tonic of the piece of music. Composers started to use secondary dominant chords in the Baroque period and they became increasingly popular in the Classical and Romantic periods. They are still a popular tool for modern day composers. Secondary Dominant Chords Explained Let’s have a look at an example to help us understand these chords. If a piece of music is in C major then the dominant chord (chord V) is G (when this chord

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