That is a hard question to answer definitively because there are a number of different factors to consider when evaluating success in music promotion. However, a few names that come to mind are Irving Azoff, Shep Gordon, and Lyor Cohen. Irving Azoff has managed some of the biggest names in the music industry such as Eagles, Van Halen, and Christina Aguilera. Shep Gordon has worked with famous musicians like Alice Cooper, Blondie, and Gwen Stefani. Lyor Cohen has been a major force in hip-hop, managing artists such as Jay-Z, Kanye West, and 50 Cent. All three men have been instrumental in helping launch the careers of countless artists and have had a major impact on the music industry.