There are at least two artists/bands going by the name of A.O.K.
These are photos from concerts where A.O.K. played, so they may be of other bands that played the concert as well.
With Full Force XV Jul 4 - 6, 2008 Löbnitz, Mecklenburg-Vorpommern, Germany Uploaded by Ziemi100feles
With Full Force XI Jul 2 - 4, 2004 04509 Löbnitz, Germany Uploaded by Laza
A.O.K. / Der Bück Dich Und Die Gichtkröten Jul 2, 1989 Frankfurt am Main, Hesse, Germany Uploaded by Murmlermicha