1. Age of Extremes 
   The Short Twentieth Century 1914 - 1991
   Resource Type: Book
   First Published: 1994   Published: 1997
   A overview of the history of the years 1914 - 1991.
2. Asch, Moses
   Connexipedia Article
   Resource Type: Article
   Founder of Folkways Records. The label, founded in 1948, was instrumental in bringing folk music into the American mainstream. (1905-1986).
3. Bird, Diz and Max at Town Hall, 1945: Birth of a Revolution
   Against The Current vol. 124
   Resource Type: Article
   First Published: 2006
   Hip-hop had a musical parallel in the 1940s. It was the music now called be-bop, although it wasn't called be-bop then. It was "the new thing" or "the revolution in music."
4. Folkways Records
   Connexipedia Article
   Resource Type: Article
   A record label that documents folk and world music.
5. Labour Songs
   Resource Type: Audio
   First Published: 1991
   1950-1985.
   
6. The Man Who Recorded the World 
   A Biography of Alan Lomax
   Resource Type: Book
   First Published: 2011
   Documentarian of the folk culture of American life,, Lomax was diligent and tireless in preserving the irreplaceable vernacular cultures that have fallen into the past.
7. Maubere Timor: Keeping East Timor's songs of resistance alive
   Resource Type: Article
   First Published: 2020
   Presumed dead for years, musician and independence fighter Berliku returns to pay tribute to his nation through music.
8. Pastures of Plenty
   A Self-Portrait
   Resource Type: Book
   
9. The People's Song Book
   Resource Type: Book
   First Published: 1948   Published: 1956
   Songs of protest and affirmation. Foreword by Alan Lomax; preface by B.A. Botkin.

Experts on Historia de la m£sica in the Sources Directory

1. Archive of Popular American Music
2. The British Library
3. Canadian Encyclopedia
4. Centre Pompidou
5. Global Music Archive
6. National Museum of American History
7. National Music Museum
8. Open Music Archive