I want to know the answer to the following question:
What kind of sound did Kanye abandon a rap and hiphop one for with his fourth album?
All the background I'm provided with is that "Rolling Stone journalist Matthew Trammell asserted that the record was ahead of its time and wrote in a 2012 article, "Now that popular music has finally caught up to it, 808s & Heartbreak has revealed itself to be Kanye’s most vulnerable work, and perhaps his most brilliant."". Is that enough to answer the question?