All possible secondary chords of the dominant (C) in F major. III<span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;"><sup>+</sup></span> is from harmonic minor and vi<span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;"><sup>o</sup></span> is from melodic minor. There is no II/V, III/V, or VI/V (but there is ii<span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;"><sup>o</sup></span>/V, <span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;">♭</span>III/V, <span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;">♮</span>III<span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;"><sup>+</sup></span>/V, <span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;">♭</span>VI/V, and vi<span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;"><sup>o</sup></span>/V).
<ul><li>Functions in major: I, ii, iii, IV, V, vi, vii<span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;"><sup>o</sup></span>.</li>
<li>Functions in natural minor: i, ii<span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;"><sup>o</sup></span>, <span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;">♭</span>III, iv, v, <span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;">♭</span>VI, and <span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;">♭</span>VII.</li>
<li>Functions in harmonic minor: i, ii<span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;"><sup>o</sup></span>, <span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;">♭</span>III<span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;"><sup>+</sup></span>, iv, V, <span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;">♭</span>VI, and <span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;">♮</span>vii<span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;"><sup>o</sup></span>.</li>
<li>Melodic minor: i, ii, <span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;">♭</span>III<span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;"><sup>+</sup></span>, IV, V, <span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;">♮</span>vi<span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;"><sup>o</sup></span>, <span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;">♮</span>vii<span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;"><sup>o</sup></span>, i, <span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;">♭</span>VII, <span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;">♭</span>VI, v, iv, <span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;">♭</span>III, ii<span class="music-symbol" style="font-family: Arial Unicode MS, Lucida Sans Unicode;"><sup>o</sup></span>, and i.</li></ul>
<a href="//commons.wikimedia.org/wiki/User:Hyacinth" title="User:Hyacinth">Hyacinth</a>
<span class="int-own-work" lang="en">Own work</span>