https://www.musical-u.com/learn/hearing-secondary-dominants/
Chord progressions make up the backbone of most popular and classical compositions. Without a strong chord progression, tunes can seem lost and aimless.
This constant pull between tension and release creates a delicate balance in songwriting. In a nutshell, chords constantly move back to the tonic chord of a song. But composers and songwriters can spice up their progressions and put a twist on this tendency with a handy technique known as “secondary dominants.”
In this article you will learn how to recognize secondary dominants and use them for songwriting, jamming and more awesome musical activities!