Remove redundant copyright header. One in music.rb is enough.

lib/music/score.rb

@@ -1,19 +1,3 @@
-# music.rb is symbolic musical computation for Ruby.
-# Copyright (C) 2008 Jeremy Voorhis <[email protected]>
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
 require 'forwardable'
 require 'music/attributes'
 require 'music/temporal'