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

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