In 2001, Dre earned a total of about US$52 million from selling part of his share of Aftermath Entertainment to Interscope Records and his production of such hit songs that year as "Family Affair" by Mary J. Blige. "Rolling Stone" magazine thus named him the second highest-paid artist of the year. Dr. Dre was ranked 44th in 2004 from earnings of $11.4 million, primarily from production royalties from such projects as albums from G-Unit and D12 and the single "Rich Girl" by singer Gwen Stefani and rapper Eve. Forbes estimated his net worth at US$270 million in 2012. The same publication later reported that he acquired US$110 million via his various endeavors in 2012, making him the highest–paid artist of the year. Income from the 2014 sale of Beats to Apple, contributing to what "Forbes" termed "the biggest single-year payday of any musician in history", made Dr. Dre the world's richest musical performer of 2015.