Live at Red Rocks 9/14/19

There’s a whole generation of kids, born in the ‘70s and ‘80s, who fell in love with the Grateful Dead just as that band was entering its final years. When some of those kids discovered Jerry Garcia’s bluegrass album, “Old & in the Way,” they realized they could mimic his improvising on portable, wooden instruments without lugging around amplifiers and extension cords. And now, it seems, there’s a jam-grass band in every neighborhood. Nonetheless, Greensky Bluegrass stands out in that crowded scene.