National Gallery, LondonWhistler's portrait of his mother is not included in the new "Janson's History of Art." Top, Tate, London; bequeathed by Arthur Studd, 1919; above, Dawoud Bey/"Janson’s History of Art," Seventh Edition THEY MADE IT Now appearing in "Janson's History of Art": Whistler's "Symphony in White No. 2," top, which replaces the portrait of his mother and shows the Japanese influence on his art; and David Hammon's "Higher Goals," above. In some ways, art history is like an episode of "The Sopranos." A relatively small number of artists are welcomed into the family of the famous, their works...