Detect lilypond language.

lib/linguist/languages.yml

@@ -387,6 +387,13 @@ Io:
   extensions:
   - .io
 
+LilyPond:
+  major: true
+  lexer: Text only
+  extensions:
+  - .ly
+  - .ily
+
 JSON:
   group: JavaScript
   lexer: JavaScript

test/test_language.rb

@@ -117,6 +117,7 @@ class TestLanguage < Test::Unit::TestCase
 
     # Missing Pygments lexers
     assert_equal Lexer['Text only'], Language['Eiffel'].lexer
+    assert_equal Lexer['Text only'], Language['LilyPond'].lexer
     assert_equal Lexer['Text only'], Language['Markdown'].lexer
     assert_equal Lexer['Text only'], Language['Max/MSP'].lexer
     assert_equal Lexer['Text only'], Language['Parrot Internal Representation'].lexer