Watch the I13#11 = II/I7 online guitar lesson by Brad Carlton from Guitar Lab: Slash Chord Formulas

This lesson will demonstrate how to view a 13#11 chord as a polychord. There are three ways you can view the 13#11 chord: I13#11 = II/I7 or I13#11 = bVIImaj7b5/I triad or I13#11 = Vm9maj7/I triad. These three formulas applied to a C13#11 produce the following breakdowns: D7/C triad, Bbmaj7b5/C triad, and Gm9maj7/C triad.