American expatriates in bohemian Paris when the 20th century was young, the Steins — writer Gertrude, her brothers Leo and Michael, and Michael's wife, Sarah — were among the first to recognize the talents of avant-garde painters like Henri Matisse and Pablo Picasso. Through their friendship and patronage, they helped spark an artistic revolution. This landmark exhibition draws on collections around the world to reunite the Steins' unparalleled holdings of modern art, bringing together, for the first time in a generation, dozens of works by Matisse, Picasso, Paul Cézanne, Pierre-Auguste Renoir, Henri de Toulouse-Lautrec, and many others. Artworks on view include Matisse's Blue Nude (Baltimore Museum of Art )and Self-Portrait (Statens Museum, Copenhagen), and Picasso's famous portrait Gertrude Stein (Metropolitan Museum of Art). Matisse, Picasso, and the Parisian Avant-Garde is on view at the San Francisco Museum of Modern Art from May 21 to September 6. www.sfmoca.org