Twenty years from now, if Detroit still exists and Chrysler continues to sell us cars built nearby, it's possible that the company's Super Bowl ad (assuming parents still let their kids play football) won't feature Motown singers or a rasping Bob Dylan but beats by J. Dilla, the late producer whose soulful notes constitute, for many hip-hop fans, the sound of the city. For the eighth year in a row, Brooklyn celebrates both the beats and the man behind them with the roving "Donuts Are Forever" party, named for Dilla's final album of instrumentals. This year's roster of DJs appearing at Brooklyn Bowl includes Good Reverend Dr. J, DJ Prince, DJ Still Life, 6th Sense, DJ Parler, and headliner DJ Jazzy Jeff.