Z and Beyonce joined a list of top music executives, led by Live Nation Entertainment chairman Irving Azoff, on Billboard magazine's first Power 100 chart on Friday. Only a handful of artists broke onto the list that sought to name the recording industry's most influential people and was dominated by businessmen and women. The selection was determined by a combination of money, market share, Billboard chart data and other information, and a team of 15 magazine editors analyzed the results to produce the list. __
