Add lylipond: Simon & Garfunkel - The boxer + replace cover

lilypond/The_boxer.ly

@@ -0,0 +1,28 @@
+\version "2.12.1"
+
+\paper
+{
+  make-footer=##f
+  make-header=##f
+
+  left-margin = 0\cm
+  top-margin = 0\cm
+  bottom-margin = 0\cm
+
+  indent = 0\cm
+  between-system-padding = 1\mm
+
+  paper-width = 7.5\cm
+  line-width = 7\cm
+  paper-height = 3.2\cm
+}
+
+{
+#(set-global-staff-size 12)
+  \key c \major
+	\time 4/4
+	\relative c'{
+  e2 g c,4 d e2  d2~ d4. g8 g2~ g4. f8 e4 g c4. g8 e4 g a e g2 f2 f2 e8 e d c d2 c2
+	}
+}
+

songs/Simon_Garfunkel/The_boxer.sg

@@ -1,5 +1,5 @@
 \songcolumns{2}
-\beginsong{The boxer}[by=Simon \& Garfunkel,cov=the-definitive]
+\beginsong{The boxer}[by=Simon \& Garfunkel,cov=Concert-in-central-park]
 
 
 \cover
@@ -53,6 +53,8 @@ That I took some comfort there.
 La, la, la, la, la, la, la.
 \endverse
 
+\lilypond{The_boxer}
+
 \beginverse
 Now the years are rolling by me,
 They are rocking evenly