"In Da Club" marks the joyful, playful start of a depressing era of party rap somewhat akin to the hair metal situation of the '80s a stretch that nonetheless yielded some gems (thanks Lil' Jon, Usher and Luda) and only now, at the end of the decade, seems to be drawing to a close.
NPR: The Decade In Music: 50 Cent's 'In Da Club' (2003)