article cleanup

First of all, as  is the primary contributor to this article, and since this is the only article he has contributed to, and given the very flattering descriptions of someone who, based on their page was not particularly active as a recording artist, I suspect that this is self-promotion.  The whole thing reads like a promo sheet.  I'm taking out all claims of superstardom or prolificness.  I will leave in a list of singles and artists that he collaborated with (after checking them on discogs and other sources).  I'm taking out the bit about his management as it seems inappropriate and is not referenced.