Neil Butterworth 
Dictionary of American Classical Composers [PDF ebook] 

The
Dictionary of American Classical Composers covers over 650 composers active from the 18th century to today. Covering all classical styles, it offers the most comprehensive overview of key composers in the United States available.
Entries include basic biographical information and critical analysis of each composer”s key works and ideas. Entries also include worklists and bibliographic information. Whenever possible, the entries will have been checked by the composers themselves to assure greatest possible accuracy. This new edition, completely updated and expanded from the 1984 edition, also includes over 200 historic photographs.