MARTIN MILLS, 66
Founder/Chairman, Beggars Group
Last Year's Rank: 63
Taylor Swift is credited with getting Apple Music to drop its demand that artists forgo payment during its three-month free trial-subscription period, but Mills fired the first warning shot when he posted a letter of concern on his company's website in mid-June. Consistently one of the larger indie operations, London-based Beggars Group finished 2015 with 0.31 percent of the market, and that doesn't include its stake in Adele's label, XL Recordings.