The rap influence is only shown in Decollage, which Jérémy didn't write. He also didn't write L'effet. I can find a good deal of similarity between the songs he did write on the album and the music on his own two albums, although in all three cases the range of styles is wide enough that there's plenty of variety. I don't think he can easily be pigeonholed.
As for the chart success, I think the limited success of the J-man's albums is due to his drawbacks as a performer, not as a composer.
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