Chord Families

This is a 2.24 minute video response from Mark Lincoln on Nov 1st, 2008

Question:

"Jzcode asks, "Brad, I would like to know what chords and chord family's should I know to be considered a good Rock Rhythm guitarist? What other chords farther up the fret board should I learn that are usually not covered in beginning lessons? An example, Dmaj7 on the 9th fret. Thanks...""