There are (or were) at least 14 bands called Empire including a podcast produced by the UK film magazine Empire.
These are photos from concerts where Empire played, so they may be of other bands that played the concert as well.
Bushwa Festival Jul 12, 2014 Providence, Rhode Island, United States Uploaded by Jon O'dea
Sonisphere 2014 UK (COMPLETE list from an event timings calendar) Jul 4 - 6, 2014 Knebworth, England, United Kingdom Uploaded by Sable D