Jasper Blom - tenorsax Wim Kegel - drums
Berend van den Berg - piano
Thomas Winther Andersen - bas
Wim Kegel - drums
Wesopa is nice local Theater in Weesp, located just outside Amsterdam.
It takes about 15 minutes by train from Amsterdam centraal station, the train also stops at Amsterdam Muiderpoort. These sundays opens with a concert with an invited group. After 16:15 it continues as jamsession with varoius guest and young talent!