• Dr. Fritz & O.G., 1988
  • Dr. Will, Louisiana, 2007
  • Dr. Will, Schmoelz, 2009
  • Nicki, Olaf, Uli, Schauburg, 2007
  • O.G. Drown'n' Tears, CircusKrone, 2007
  • O.G. & Jimmy Descant, 2005
  • O.G. & Prof. Saltzmann, 2009
  • O.G. & W. Goehringer, 2009
  • Blues Session, Grend Kulturzentrum, Essen, 2012 (v. l.: O.G., Dumpy, Ingo, EMU, Manu)
  • O.G. & Barny and Guenter, 2009