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.
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