It's that time of year, the last weekend in July when NPR Music covers the friendliest festival around, the Newport Folk Festival.The festival's nearly 60-year history is steeped in the roots of American traditions and expands beyond the singer-songwriter tradition that the words "folk music" might conjure. This year we'll be treated to electronic R&B from Moses Sumney, the gospel sounds of War & Treaty, lyrical rock from Courtney Barnett, the Nashville sounds of Margo Price and Jason Isbell, the brilliant guitar of St. Vincent, instrumental vibes from Khruangbin and so much more