
How to Use Passing Chords & Tritone Bass Substitution on the Piano
Carson Bruce continues a music theory series on the Worship Keys podcast, moving beyond last week’s circle of fifths episode into passing chords. He explains secondary dominants (the “five of” the next chord) using a memorization tool called the “musical phone number” 736-2514, derived from the circle of fifths, to help choose what chord can precede another in a progression. In C, he demonstrates how these ideas spice up simple progressions in songs like “Amazing Grace” and “How Great Is Our God,” emphasizing slash-chord/left-hand approaches and using major dominant chords before IV, V, and vi (e.g., I7→IV, II7→V, III7→vi). He then introduces tritone bass substitution, replacing a dominant 7 with another dominant a tritone away (often thought of as playing a dominant a half-step above the destination), demonstrates it in “We Wish You a Merry Christmas,” and encourages practicing these concepts in every key.
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