Categories Guitar Guitar Lessons Learning & Teaching Harmonic Literacy for Guitar XI: Triskaidekaphilia! 13th Chords Everywhere! Post author By miltonline Post date August 19, 2011 No Comments on Harmonic Literacy for Guitar XI: Triskaidekaphilia! 13th Chords Everywhere! Harmonic Literacy for Guitar XI: Triskaidekaphilia! 13th Chords Everywhere!.