He has co-written many songs with long-time collaborator and composer Michael Saxell for various projects including Gör mig lite levande which is a CD and nationwide stage show with Swedish singer Lill Lindfors and En känsla av ljus, which is a concert Werup and Saxell wrote and performed with Mats Ronander and Benneth Fagerlund.
According to author John Kennedy O'Connor's book The Eurovision Song Contest - The Official History, the EBU was not pleased with this stunt.
Viveca Lindfors | Lill Lindfors | John Lill | Barbro-Lill Hætta-Jacobsen | Denis Lill | Tove Lill Løyte | Stefan Lindfors | Lindfors | Lill Tschudi | Andreas Lill |
He has worked together with artists such as Povel Ramel (in the revue I hatt och strumpa in 1961-62), Anita Lindblom, Lill Lindfors and Eva Rydberg.