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.
Big Guava Music Festival 2015 May 8 - 9, 2015 Tampa, Florida, United States Uploaded by Raúl Castillo
Big Guava Music Festival 2015 May 8 - 9, 2015 Tampa, Florida, United States Uploaded by Mgilberto1007
Big Guava Music Festival 2015 May 8 - 9, 2015 Tampa, Florida, United States Uploaded by Leets
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
Ivory Theory / Stoop Goodnoise / Empire / August Premier / Counterpunch / Lifeline / Action Blast / Farraday Nov 5, 2011 Chicago, Illinois, United States Uploaded by Matt Faleni
U2 / Damian 'Jr Gong' Marley / Empire Oct 28, 2005 Houston, Texas, United States Uploaded by John Fortier