Bass Lesson Block
Music is not always purely diatonic. This block introduces you to common chords often mixed in among diatonic chords
When analyzing music you'll find songs are often not purely diatonic. Where do these other chords come from?
Secondary, or applied, dominants are a special use of a dominant 7th chord leading to chords other than the tonic.
Changing between related major and minor keys is a very common key change.