There are at least two artists with this name: a German girl group and a British rock band.
These are photos from concerts where Wonderwall played, so they may be of other bands that played the concert as well.
Wonderwall
The Guess Who / Wonderwall Oct 7, 2005 Greensboro, North Carolina, United States Uploaded by Jmdiff
Guess Who
Mathew Street Festival Aug 24 - 26, 2003 Liverpool, England, United Kingdom Uploaded by Jmdiff Credit: Marc Diffendal