​SECONDARY TRIADS

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The secondary triads are ii, iii, vi, and viio.  They are named the supertonic, mediant, submediant and leading tone.  

• I           
• ii             Supertonic
• iii             Mediant
• IV           
• V                                                              
• vi            Submediant
• viio         Leading Tone                                                                    . 

 SUBSTITUTION​
​Each secondary triad is related to a primary triad through two common tones and thus can substitute for the primary triads.

You can substitute secondary triads for the following primary triads:

• vi    for    I
• ii     for    IV
• iii or viio   for    V

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