All I know is that this orchestra was very popular in the 1960s in Ivory Coast. And I can fully understand why.
I'll go as far as to state that I feel cheated in not knowing about Yapi Jazz and Super Yapi until a few years ago. Who is holding the music of bands like these* back? Why isn't this music available on a series of CD's?
The music is original, although I am sure western producers won't be able to resist the temptation to label it afro-cuban or to compare it with the congolese rumba. Of course it has traces of all kinds of musical styles, but so has american soul music (but I don't think anyone is going to label that afro-cuban).
Here are two EP's, both on the Safie Deen label. After listening to these tracks I am sure you will agree with the motto "Achetez Ivoirien"!
*because there are others, notably Amedée Pierre & L'Ivoiro Star (of whom I will post some tracks later).