The production and the beats from Kjell Nelson on 2015’s #BlakFriday: The Mixtape span a broad landscape. Find a comfortable chair and your best pair of headphones, and listen for the horizons. Spitter Silas Blak is Seattle hip-hop royalty: Summarizing our city in sentence fragments, somehow plainspoken and abstract, both at the same time. “The Exchange” is an unexpected club banger, that’ll leave you desiring crowds and lights, in a record that otherwise surfs in solitude: “Silas at the bus stop, barking at my shadow,” he recites as a mantra towards the end of “Bus Stop.”