There are at least four bands that are named Cog. One from Australia, one from the Philippines, one from Croatia, and one from the USA.
These are photos from concerts where Cog played, so they may be of other bands that played the concert as well.
Thrashville 2023 Sep 8 - 9, 2023 Hunter Valley, NSW, Australia Uploaded by Lola Willows
Cog Mar 19, 2017 Uploaded by Kierankrud
Cog Jul 15, 2016 Melbourne, Victoria, Australia Uploaded by Aphex Bob
Big Day Out 2009 Jan 30, 2009 Wayville, South Australia, Australia Uploaded by Silly Billy
Big Day Out 2009 Jan 26, 2009 Melbourne, Victoria, Australia Uploaded by Mike G Force
Cog / Kora & Jakob / Sleep Parade / Melodyssy Jun 5, 2008 Hobart, Tasmania, Australia Uploaded by Wattoson
Cog May 23, 2008 Gold Coast, Queensland, Australia Uploaded by Aphex Bob
Laura / Cog Jun 11, 2007 Melbourne, Victoria, Australia Uploaded by 3000tapes
Cog Oct 20, 2006 Brisbane, Queensland, Australia Uploaded by Aphex Bob
Big Day Out 2006 Feb 3, 2006 Wayville, South Australia, Australia Uploaded by Stan Stan Stan
