The new album Lost And Found compiles unheard recordings from the Buena Vista Social Club sessions, as well as solo work from the musicians involved. Alejandro Perez /Courtesy of the artist hide caption

itoggle caption Alejandro Perez /Courtesy of the artist

Legendary norteño group Los Alegres de Terán, in a promotional still from the 1976 documentary Chulas Fronteras. Courtesy of The Arhoolie Foundation Frontera Archive/UCLA Chicano Studies Research Center Press hide caption

itoggle caption Courtesy of The Arhoolie Foundation Frontera Archive/UCLA Chicano Studies Research Center Press

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