Could you clarify if you are looking for information regarding:
: A specific improvisation by Martin Mans performed on an Allen GX235 concert organ in the Grote of Sint-Stephanuskerk in Hasselt . martin_mans_allen_orgel_improvisatie_op_bergen_...
: General performances or recordings by Martin Mans at the Gertrudiskerk or other locations in that specific city. Could you clarify if you are looking for