SAN FRANCISCO (AP) — Apple is orchestrating a $3.2 billion acquisition of Beats Electronics, the headphone maker and music streaming distributor founded by hip-hop star Dr. Dre and music industry impresario Jimmy Iovine, according to a published report. The potential acquisition would add Beats Electronics' popular line of headphones and music streaming service to an Apple line-up that already includes digital music players and the iTunes store, the world's top music retailer. The innovative void has increased the pressure on Jobs' hand-picked successor, Tim Cook, to prove he is capable of sustaining the success and growth that turned Apple into the world's most valuable company and a beloved brand. The negotiations also are taking place as the music market increasingly tilts toward streaming and away from the downloads that once drove the success of Apple's digital music store, iTunes.