<div class="thumb tright"><div class="thumbinner" style="width:222px;"><a href="//commons.wikimedia.org/wiki/File:Circle-of-fifths.svg" class="image"><img src="https://upload.wikimedia.org/wikipedia/commons/thumb/1/1f/Circle-of-fifths.svg/220px-Circle-of-fifths.svg.png" decoding="async" width="220" height="220" class="thumbimage" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/1/1f/Circle-of-fifths.svg/330px-Circle-of-fifths.svg.png 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/1/1f/Circle-of-fifths.svg/440px-Circle-of-fifths.svg.png 2x" data-file-width="4287" data-file-height="4291"></a>  <div class="thumbcaption"><div class="magnify"><a href="//commons.wikimedia.org/wiki/File:Circle-of-fifths.svg" class="internal" title="Enlarge"></a></div>Circle of fifths with upper case for major, lower case for minor</div></div></div>
<p>The 24 triads on the piano keyboard, arranged in a circle with key numbers from 0 to 11
</p><p>Major triads start and end with red keys, minor triads with blue keys.<br>
Major thirds are represented by black lines.<br>
Black keys have a gray background.
</p><p>This diagram doubles as a <a href="https://en.wikipedia.org/wiki/circle_of_fifths" class="extiw" title="w:circle of fifths">circle of fifths</a> with red for major and blue for minor.<br>
The original file is more symmetrical, while this one is tilted by 15° so that it has the usual orientation with <span style="color:blue;">a</span>/<span style="color:red;">C</span> on top.
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<div class="thumb tleft"><div class="thumbinner" style="width:222px;"><a href="//commons.wikimedia.org/wiki/File:Keys_in_dozenal_clock.svg" class="image"><img src="https://upload.wikimedia.org/wikipedia/commons/thumb/1/11/Keys_in_dozenal_clock.svg/220px-Keys_in_dozenal_clock.svg.png" decoding="async" width="220" height="210" class="thumbimage" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/1/11/Keys_in_dozenal_clock.svg/330px-Keys_in_dozenal_clock.svg.png 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/1/11/Keys_in_dozenal_clock.svg/440px-Keys_in_dozenal_clock.svg.png 2x" data-file-width="675" data-file-height="645"></a>  <div class="thumbcaption"><div class="magnify"><a href="//commons.wikimedia.org/wiki/File:Keys_in_dozenal_clock.svg" class="internal" title="Enlarge"></a></div>This file uses <a href="https://en.wikipedia.org/wiki/duodecimal" class="extiw" title="w:duodecimal">duodecimal</a> digits for the keys.</div></div></div>
<table><tbody><tr><td style="padding: 15px;"><a href="//commons.wikimedia.org/wiki/File:Watchduck.svg" class="image"><img alt="Watchduck.svg" src="https://upload.wikimedia.org/wikipedia/commons/thumb/d/d8/Watchduck.svg/40px-Watchduck.svg.png" decoding="async" width="40" height="46" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/d/d8/Watchduck.svg/60px-Watchduck.svg.png 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/d/d8/Watchduck.svg/80px-Watchduck.svg.png 2x" data-file-width="703" data-file-height="806"></a>
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<td><a href="//commons.wikimedia.org/wiki/User:Watchduck" title="User:Watchduck">Watchduck</a><br><span style="color: gray; font-size: 80%;">You can name the author as "T. Piesk", "Tilman Piesk" or "Watchduck".</span>
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<span class="int-own-work" lang="en">Own work</span>