This is a Debian prepackaged version of rbscrobbler.

This package was put together by Joey Hess <joeyh@debian.org>, using
sources from the webpage <http://members.cox.net/alexrevo/>. This is the
copyright of most of rbscrobbler:

# Copyright (c) 2005 Alex Revo
#
# 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 2 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, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

eggtrayicon.c has the following copyright:

/* eggtrayicon.c
 * Copyright (C) 2002 Anders Carlsson <andersca@gnu.org>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

On Debian systems, the full text of the GPL can be found in 
/usr/share/common-licenses/GPL

The singeletonmixin class has the following copyright:

By Gary Robinson, grobinson@transpose.com. No rights reserved -- 
placed in the public domain -- which is only reasonable considering
how much it owes to other people's version which are in the
public domain. The idea of using a metaclass came from 
a  comment on Gary's blog (see 
http://www.garyrobinson.net/2004/03/python_singleto.html#comments). 
Not guaranteed to be fit for any particular purpose.


