Photo by Alex Welsh

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James Blake took the stage at Bonnaroo on Saturday, performing a great number of tracks off Variance's 2013 Album of the Year Overgrown. But he's halfway done with his next project, which he hopes to release by early 2015.

In a new interview with Billboard, Blake said he's been writing with Justin Vernon of Bon Iver "and sporadically Kanye [West], when he's around." He did, however, warn that "it's hard to know what will actually end up on the record."

Speaking with Variance last year, Blake said West is "really supportive and a real music lover. He obviously has his ears to the ground. And whatever you want to say about Kanye, he really cares about his music and I respect that.”