Josh Lopez Josh Lopez has been a contributor to the songs of R&B artists such as Macy Gray, Bruno Mars and will.i.am. He was among the eight writers that contributed to the huge hit of 2008, "American Boy" recorded by Estelle feat. Kanye West. The song reached the UK No.1 spot and hit the US Top 10. It then went on to win a Grammy for for Best Rap/Sung Collaboration and was nominated for Song of the Year.