digraph {
  layout="neato";
  overlap="scale";
  splines="true";
  outputorder="edgesfirst";
  bgcolor="black";

  edge [fontcolor="gray"];

  node [style="filled", fillcolor="black", fontcolor="white"];
  maj0 [label="C major"];
  maj1 [label="C# major\nDb major"];
  maj2 [label="D major"];
  maj3 [label="D# major\nEb major"];
  maj4 [label="E major"];
  maj5 [label="F major"];
  maj6 [label="F# major\nGb major"];
  maj7 [label="G major"];
  maj8 [label="G# major\nAb major"];
  maj9 [label="A major"];
  maj10[label="A# major\nBb major"];
  maj11[label="B major"];

  min0 [label="C minor"];
  min1 [label="C# minor\nDb minor"];
  min2 [label="D minor"];
  min3 [label="D# minor\nEb minor"];
  min4 [label="E minor"];
  min5 [label="F minor"];
  min6 [label="F# minor\nGb minor"];
  min7 [label="G minor"];
  min8 [label="G# minor\nAb minor"];
  min9 [label="A minor"];
  min10[label="A# minor\nBb minor"];
  min11[label="B minor"];

  subgraph {
    cluster=true;
    node [style="filled", shape="rect"];
    key0 [label="Perfect 5th", fillcolor="blue", fontcolor="white"];
    key2 [label="Relative minor", fillcolor="pink", fontcolor="black"];
    key3 [label="Relative major", fillcolor="yellow", fontcolor="black"];
  }

  edge [color="blue", style="filled", fillcolor="blue"];
  maj0 -> maj7;
  maj1 -> maj8;
  maj2 -> maj9;
  maj3 -> maj10;
  maj4 -> maj11;
  maj5 -> maj0;
  maj6 -> maj1;
  maj7 -> maj2;
  maj8 -> maj3;
  maj9 -> maj4;
  maj10 -> maj5;
  maj11 -> maj6;
  min0 -> min7;
  min1 -> min8;
  min2 -> min9;
  min3 -> min10;
  min4 -> min11;
  min5 -> min0;
  min6 -> min1;
  min7 -> min2;
  min8 -> min3;
  min9 -> min4;
  min10 -> min5;
  min11 -> min6;

  edge [color="pink", style="filled", fillcolor="pink"];
  maj0 -> min9;
  maj1 -> min10;
  maj2 -> min11;
  maj3 -> min0;
  maj4 -> min1;
  maj5 -> min2;
  maj6 -> min3;
  maj7 -> min4;
  maj8 -> min5;
  maj9 -> min6;
  maj10 -> min7;
  maj11 -> min8;

  edge [color="yellow", style="filled", fillcolor="yellow"];
  min0 -> maj8;
  min1 -> maj9;
  min2 -> maj10;
  min3 -> maj11;
  min4 -> maj0;
  min5 -> maj1;
  min6 -> maj2;
  min7 -> maj3;
  min8 -> maj4;
  min9 -> maj5;
  min10 -> maj6;
  min11 -> maj7;
}