Cornerstones of the collection include Picasso's portrait of Gertrude Stein, Jasper Johns's "White Flag", Jackson Pollock's "Autumn Rhythm (Number 30)", and Max Beckmann's triptych "Beginning". Certain artists are represented in remarkable depth, for a museum whose focus is not exclusively on modern art: for example, ninety works constitute the museum's Paul Klee collection, donated by Heinz Berggruen, spanning the entirety of the artist's life. Due to the Met's long history, "contemporary" paintings acquired in years past have often migrated to other collections at the museum, particularly to the American and European Paintings departments. In April 2013, it was reported that the museum was to receive a collection worth $1 billion from cosmetics tycoon Leonard Lauder. The collection of Cubist art includes work by Pablo Picasso, Georges Braque and Juan Gris and went on display in 2014. The Met has since added to the collection, for example spending $31.8 million for Gris' "The musician's table" in 2018. The Met's collection of musical instruments, with about 5,000 examples of musical instruments from all over the world, is virtually unique among major museums. The collection began in 1889 with a donation of 270 instruments by Mary Elizabeth Adams Brown, who joined her collection to become the museum's first curator of musical instruments, named in honor of her husband, John Crosby Brown. By the time she died, the collection had 3,600 instruments that she had donated and the collection was housed in five galleries. Instruments were (and continue to be) included in the collection not only on aesthetic grounds, but also insofar as they embodied technical and social aspects of their cultures of origin. The modern Musical Instruments collection is encyclopedic in scope; every continent is represented at virtually every stage of its musical life. Highlights of the department's collection include several Stradivari violins, a collection of Asian instruments made from precious metals, and the oldest surviving piano, a 1720 model by Bartolomeo Cristofori. Many of the instruments in the collection are playable, and the department encourages their use by holding concerts and demonstrations by guest musicians. The Met's collection of photographs, numbering more than 25,000 in total, is centered on five major collections plus additional acquisitions by the museum. Alfred Stieglitz, a famous photographer himself, donated the first major collection of photographs to the museum, which included a comprehensive survey of Photo-Secessionist works, a rich set of master prints by Edward Steichen, and an outstanding collection of Stieglitz's photographs from his own studio.