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Concert: Alison Krauss & Union Station at Wolf Trap Alison Krauss holds the honor of having sung both the most beautiful song in the world, and the saddest. For "O Brother Where Art Thou?" (another Coen Bros classic), Krauss sang the gospel call to prayer, "Down to the River to Pray." You don't have to appreciate the message to fall head over heels for the meter and melody of Krauss's hymn, which adds more singers with every chorus. In 2005, Brad Paisley won Song of the Year from the Country Music Association for "Whiskey Lullaby," a tragic ode to a pair of lovers who drink themselves to death, each missing the other. The song is one of three Paisley hits to go platinum, and it likely would not have done so had it not been a duet with Krauss. With Union Station, Krauss plays a more pure form of bluegrass, full of joy, banjo rolls, and Krauss' quivering voice. August 7 at Wolf Trap, 1645 Trap Road, Vienna, Va. Phone: (703) 255-1900. Web; www.wolftrap.org

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