Arthur,

Thank you for your kind remarks. Like you, I am a beginner, but unlike you, I'm not old. I'm 73 years young! Ha Ha Glad you appreciated the talk about chord construction. Again, thanks for showing your appreciation.

Lrngkybrd,

Cadd9 and C9 are DIFFERENT chords. Cadd9 is exactly what it implies i.e., a basic C chord (C, E, G,) with the note D added. It is not a dominant chord. You DO NOT include the b7 (B flat) in a Cadd9 chord. Play both Cadd9 and C9 and you will hear the harmonic difference.

Chuck