don't worry if i write songs ♪ >> now we can also call sean diddy co combs foshs richest musician with a net worth of $580 million. coming in second, jay z. $470 million. and dr. dre in third place, $350 million. robin williams $154 million. and 50 cent whose net worth is $125 million. that's a lot of million dollars. >> 50 cent. >> i know. i even practiced. are you proud of me? >> he is worth how many? >> $125 million. you know what is interesting about this? >> not worth 50 cent. >> most of this comes from work outside music. this is all the extra stuff they do. diddy has a vodka and all sorts of things. >> good for them. erin burnett is going "outfront" at the top of the