\version "2.19"

%% Copyleft 2016 Pierre Perol-Schneider
#(define-markup-command (logo layout props size) (number?)
  "Draw a LilyPond logo"
  (interpret-markup layout props
    (markup 
      (#:stencil 
       (make-path-stencil
        '(M  0.00  1.40
          L  0.76  1.40
          C  0.79  1.58  0.83  1.70  0.92  1.92
          C  1.35  1.70  1.45  1.58  1.59  1.41
          C  1.80  1.65  1.90  1.75  2.22  1.91
          C  2.35  1.70  2.40  1.57  2.44  1.40
          L  3.26  1.40
          C  3.27  0.49  2.50 -0.21  1.63 -0.21 
          C  0.76 -0.21  0.00  0.49  0.00  1.40
          M  0.13  1.26
          C  0.20  0.54  0.78  0.09  1.21 -0.01
          C  0.89  0.33  0.71  0.70  0.75  1.26
          L  0.13  1.26
          M  0.99  1.74
          C  0.78  1.20  0.80  0.45  1.46 -0.06
          C  1.59 -0.08  1.66 -0.08  1.75 -0.07
          C  1.90  0.45  1.88  1.21  0.99  1.74
          M  1.68  1.30
          C  1.87  1.00  2.03  0.60  1.90 -0.05
          C  1.93 -0.05  1.94 -0.04  1.97 -0.035
          C  2.46  0.54  2.46  1.19  2.17  1.73
          C  1.90  1.58  1.88  1.54  1.68  1.30
          M  2.47  1.26
          C  2.52  0.84  2.52  0.58  2.20  0.04
          C  2.85  0.33  3.07  0.78  3.12  1.26
          L  2.47  1.26
          Z)
        0 size size #t)))))

%% Test:
\pointAndClickOff
\paper {
  paper-height = 50
  paper-width = 150
}

\header {
  title = \markup { This: \logo #2 is a logo }
  tagline = \markup
    \fill-line {
     \concat { 
       "Music engraved using "
       \logo #1 \hspace #.3 
       "LilyPond 2.19.48—www.lilypond.org" 
      }
    }
}

{ c' }