title: Changing all the colors in Lilypond
body: <p>In Lilypond I can change the color of one type of object with a line like </p>
  
  <p><code>\override Staff.Clef  #'color = #(rgb-color 0.4 0.5 0.6)</code></p>
  
  <p>I'd like to have everything in the same (non-default) color, but I neither found a list of all the objects I could color nor did I find a command to change all the colors at once. Could anybody please point me to either?</p>