Gilberto Gil, pictured here on the cover of Luar (A Gente Precisa Ver o Luar), is one of the many artists we listen to this week to understand the concept of "saudade." Courtesy of the artist hide caption

itoggle caption Courtesy of the artist

Joao Gilberto was one of the key bossa nova pioneers. Hulton Archive/Getty Images hide caption

itoggle caption Hulton Archive/Getty Images