7 types of 9ths and their uses

Like chords... ...not all add-tones (chord extensions like 7ths, 9ths, 11ths, etc.)... ...are created equal. One add-tone that's become more and more popular in LDS music land... ...is the 9th. Yet, I find that it's often used haphazardly by just chucking it onto any old chord at any old time. There's a better way. Though we're not really getting into that here. It's more of a voice-leading topic, which I'll save for another day. Today, I want to help you add to your harmony color palette by...