Louis Armstrong at the 1959 Blokker Festival

There are some concerts which are, even after decades, still fresh in mind. Each jazz fan has such memorable concerts in mind. For a lot of Dutchmen, most of pensionable age now, the Blokker concerts of the 1950s and 1960s are still legendary, like the concerts of Benny Goodman (1958) and Louis Armstrong (1959 and 1965). [Source]