[1] His poems cover topics such as life in the city of Rotterdam, drug use,[2] and jazz.

[3] He was well known in the Netherlands for his live performances and appearances in Dutch popular media.

"[7][8] In 1954, Deelders discovered jazz at the age of 9 when he first heard Chet Baker.

[10] [11] He also wrote scripts for the comic book series Amber en Akka and Professor Hilarius, drawn by Rob Peters.

[12] He furthermore inspired a celebrity comic of his own, Juul Deeldert, drawn by Vick Debergh.