1) John O'Callaghan is an Irish DJ, mainly producing electronic music. He also produces music under the alias of <a href="http://www.last.fm/music/Joint+Operations+Centre" class="bbcode_artist">Joint Operations Centre</a>, <a href="http://www.last.fm/music/Mannix" class="bbcode_artist">Mannix</a> and <a href="http://www.last.fm/music/Stenna" class="bbcode_artist">Stenna</a>.
John O'Callaghan
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