When Pink Floyd released Dark Side of the Moon in 1973, it was a breakthrough for the band's label, Harvest Records. MDV/Flickr Creative Commons hide caption

itoggle caption MDV/Flickr Creative Commons

A worker unveils posters Tuesday for the coming season of New York's Metropolitan Opera. The Met's fall schedule could be in jeopardy if failed labor negotiations result in a lockout Friday. John Moore/Getty Images hide caption

itoggle caption John Moore/Getty Images

Austrian pianist Paul Wittgenstein (who later became an American citizen) lost an arm in World War I. He commissioned composers including Maurice Ravel to write pieces for the left hand alone. Bettmann/CORBIS hide caption

itoggle caption Bettmann/CORBIS

Bryn Terfel as Wotan in the Met's production of Wagner's Ring cycle, one of the productions that has been criticized by some as too costly. Ken Howard /Metropolitan Opera hide caption

itoggle caption Ken Howard /Metropolitan Opera

Metropolitan Opera General Manager Peter Gelb has warned union workers of a lockout if a contract deal isn't settled by July 31. Astrid Stawiarz/Getty Images hide caption

itoggle caption Astrid Stawiarz/Getty Images

Kendrick Lamar (right) onstage at the BET Hip Hop Awards 2013 in Atlanta with Ali, TDE's engineer and sometimes DJ. Rick Diamond/BET/Getty Images for BET hide caption

itoggle caption Rick Diamond/BET/Getty Images for BET

Jorge Drexler's new album, Bailar en la Cueva, ventures into new territory for him: dance rhythms. Thomas Canet/Courtesy of the artist hide caption

itoggle caption Thomas Canet/Courtesy of the artist

The 1954 Elvis Presley single "You're a Heartbreaker," recorded at one of the singer's early sessions at Sun Studio. Michael Ochs Archives/Getty Images hide caption

itoggle caption Michael Ochs Archives/Getty Images

Maddie Marlow and Tae Dye, whose first single, "Girl In A Country Song," takes aim at one-dimensional representations of women in country music. Kevin White/Courtesy of the artist hide caption

itoggle caption Kevin White/Courtesy of the artist