Dierks Bentley is expected to release a bluegrass album, Up on the Ridge, this summer on Capitol Nashville. Guests include Alison Krauss, Miranda Lambert, the Del McCoury Band, Sam Bush, Tim O'Brien, Chris Thile and the Punch Brothers. Bentley partnered with singer-songwriter-producer Jon Randall Stewart and Grammy-winning recording engineer Gary Paczosa for the project. "This album won't come as a surprise to my hard-core fans," says Bentley. "They've asked me: 'When are you going to make a bluegrass record?' And I was just waiting for the right time."