The button icons came from Jamboree (the eject icon is the previous icon
rotated and flipped):

  Copyright (C) 2003 Richard Hult <richard@imendio.com>
  Copyright (C) 2003 Anders Carlsson <andersca@gnome.org>

  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.

potamus.svg is the U+266C BEAMED SIXTEENTH NOTES character from the
Dustismo Roman font from <http://www.dustismo.com/>:

  Dustismo is Copyright (C) 2002 Dustin Norlander

  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.

