Almost every rapper now says their name at the beginning of all their songs... I think it has to do with the fact that rap fans get hooked on one of the songs, so they download just that one track illegally, and so then they get reminded of who sings it.
*track starts bumpin'*
YO DAWG, WHO DAT?
"SOULJA BOI, TOLD YA!"
OH SNAP DAWG, IT'S MAH BOY, SOULJA BOI!!!!