The WDR Big Band is one of the top european big band . Its a radion employed orchestra and has good financial sources for the members.
Have followed the weekly radio broadcasts from the early 1980s on and have about several hundred files from their FM radio concerts with great US and european soloists.
The band had no regular drummer during the 1980s so there was a regular collaboration for example with Mel Lews (he is quoted: the WDR BB is my second orchestra).
In addition Bill Holman preferred to present his own compositions and suites the first time for an public auditorium here in Cologne at various places rather than in the US. Many famous US stars were featured in these public concerts.
Also the leaders for these public concerts changed very often. Bill Holman was one of them.
Radio WDR had offered a software "radiorecorder" for the fans of the band to record these events for free and private use (burn your own CDrs, what i did also.
Here is an example :
https://up.picr.de/50579005at.jpg