diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..dc7c078
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+The MIT License
+
+Copyright (c) 2010 Kyo Endo
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/bloopsong.rb b/lib/bloopsong.rb
similarity index 100%
rename from bloopsong.rb
rename to lib/bloopsong.rb
diff --git a/mario_theme.rb b/sample/mario_theme.rb
similarity index 99%
rename from mario_theme.rb
rename to sample/mario_theme.rb
index 1684bcd..f4845fc 100644
--- a/mario_theme.rb
+++ b/sample/mario_theme.rb
@@ -1,6 +1,3 @@
-#!/usr/local/bin/ruby
-# -*- encoding:utf-8 -*-
-
 require_relative "bloopsong"
 
 mario =
diff --git a/sample.rb b/sample/sample.rb
similarity index 100%
rename from sample.rb
rename to sample/sample.rb
diff --git a/zelda_theme.rb b/sample/zelda_theme.rb
similarity index 100%
rename from zelda_theme.rb
rename to sample/zelda_theme.rb