For 16 years everything was OK, Dieter was good and SIB accepted their role. But after they couldn't agree about money, they decided to talk to everyone that his songs are produced and sung by them.
They are good in making backgrounds and HPV, but there was no problem for Dieter to find another team that can do the same. Just listen the last 3 albums, the chorus is 100% the same, but none of SIB sang anything there. They cant produce the same sound like BOHLEN & RODRIGUEZ, NOW all their songs have the same boring beat.
So, if there are people who like their music, it's OK. But expecting they will hit the charts doesn't have any sense.