IN THE PAST 20 YEARS, HIP-hop has produced enough wanna-be Warren Buffetts to fill the biggest strip club in Atlanta. But, according to Forbes editor Zack O’Malley Greenburg’s new book, 3 Kings, only a trio of artist-entrepreneurs have risen to a status that rivals the corporate titans: Jay-Z, Dr. Dre and Diddy. What sets them apart? “[They] built their fortunes by creating a 24/7 head-to-toe lifestyle,” Greenburg writes, having branched out into movies, sports management, alcohol, fashion, TV, music streaming and beyond. Greenburg did more than 100 interviews for the project – including paying a surprise visit to Tidal’s shadowy Oslo headquarters – connecting the kings’ artistic personae to their endeavors: Dre, the laborious sonic perfectionist, marketed audiophile-worthy Beats headphones to the masses; Jay, the reserved jet-set player, has invested…