Kayak stamp

This year, Dutch postal services PostNL released a series of stamps dedicated to "Nederpop", Dutch music from the 1960's until the present day. In march, they released a stamp with "Starlight Dancer". Through an app connected with the stamp, it was also possible to hear a snippet of the actual music.

As far as I know, the stamps were only available through a "collector's subscription", and were not for sale at post offices etc.