There are at least six acts by the name of Omar:
Note: These are photos from concerts where Omar played, so they may be of other bands that played the concert as well.
Surrey Session Stage (Stage 3, during New Hawleans Jug Band or True Detectives?)
Magic Summer Live 2013
Uploaded by Craig Hatfield
More Music Stage (Stage 2)
Main Stage (during Level 42)
Soul II Soul