In addition to being an artist himself, Karst also wrote songs for others. Such as for Frans Duijts, who joined the A.D Karst “thank you for all the songs you wrote for me. Heaven has a star richer, and what a star.” Also Monique Smith has worked with the Hoogeveen singer for years. “He is a great artist and above all a sweet man. Thank you for always a listening ear and good advice, the most beautiful texts, poems and songs.”

