Image sources:

• – Metallica in South America:
  http://i290.photobucket.com/albums/ll246/jimcueva/metallica-hall-fame.jpg
• – Guns ‘N Roses in Everywhere:
  http://80s-music.net/wp-content/uploads/2008/07/axl_rose_gnr.jpg
• – Paul Robeson in New York:
  http://t1.gstatic.com/images?q=tbn:ANd9GcQsblJXf2fWrb0KoQZ38PKlqZz6KAET5F7To04aa3cKcxwQ00w&t=1&usg=__z5s4a78Futh-aERgeHjV4XmFOi0=
• – Altamont Free Concert in California:
  http://t1.gstatic.com/images?q=tbn:ANd9GcRdTt-acF185mfSInAy-MM7nOhFkTJFko_iQ86yluoDa2pT738&t=1&usg=__RExlp8J9KGyTeDRsMCj3KiCBAUU=