20th- & 21st-Century Music: A Guide to Research and Resources
This guide presents basic and specialized resources for researching the music composed during the 20th- and 21st-Century. It broadly covers all the styles, genres, cultures, creators, and social aspects of music that flourished during this time period. Co
Traces the progressive fragmentation of the European 'art' tradition, and its relocation as one tradition among many at the century's end. Sets musical developments in the context of social, ideological, and technological change, and to understand reception and consumption as integral to the history of music.
The Cambridge History of Twentieth-Century Music (Online) by 
