"Rolling Stone" credited West with transforming hip-hop's mainstream, "establishing a style of introspective yet glossy rap." West also has been credited with the commercial decline of the gangsta rap that once dominated mainstream hip-hop. The outcome of a highly publicized sales competition between rapper 50 Cent's "Curtis" and West's "Graduation" marked a turning point in the music industry. With its emotive raps and confessional details, the album altered the direction of hip hop and helped pave the way for new rappers who did not follow the hardcore-gangster mold to find wider mainstream acceptance. According to Ben Detrick of "XXL" magazine, West effectively led a new wave of artists, including Kid Cudi, Wale, Lupe Fiasco, Kidz in the Hall, and Drake, who lacked the interest or ability to craft lyrical narratives about gunplay or drug-dealing. Rosie Swash of "The Guardian" deemed the sales competition a historical moment in hip-hop, because it "highlighted the diverging facets of hip-hop in the last decade; the former was gangsta rap for the noughties, while West was the thinking man's alternative." It was West's fourth studio album "808s & Heartbreak" (2008), that may stand as his most influential work. Though "808s & Heartbreak" polarized listeners upon release, the album was a commercial success and impacted popular music stylistically. It laid the groundwork for a new wave of artists who generally eschewed typical rap braggadocio for confessional, intimate subject matter and introspection, including Drake, Frank Ocean, Future, J. Cole, Kid Cudi, Childish Gambino, The Weeknd and Tyler, the Creator.