the main problem there is that the demand of rumbas never dries up,jb werra fally ferre koffi heritier fabregas... if they want they can make 50 songs albums just based on potential demand of customers,as they have to drop people to next album to have a "reasonable" number of say 30 song
very very few people want sebene songs,and musicians feel that maximum 3 generiques is more than enough to satisfy their atalakus(also with the difficult public we have now i wont be surprised if one tried let say 9 sebene songs all having a same main animation like it was in the glory days people would say its monotonous,you'll even notice that more and moe when they do 3 generiques there is not even one animation which makes it in two of them)