A line-up of Dutch military motorcyclists led by a three-wheeled motorcycle with timpanist during an inspection for the birthday of Princess Juliana on April 30, 1940.

 The timpanist belongs to the Hussars Motorcyclists Regiment. The picture was taken during the mobilization of the Dutch army and 10 days prior to the German invasion of The Netherlands

If that's not the only time you've ever seen a drummer on a trike, in a military parade, let me know.

https://www.facebook.com/HistoryisallaboutColour/posts/3088980007788830
https://www.facebook.com/HistoryisallaboutColour/

Thanks Marc!