Joseph Marx (1882-1964): Extensive, multi-chapter biography (also available in one HTML or PDF file), list of works, audio samples, discography, bibliography, links.
Joseph Marx (1882-1964): Listing at The Lied and Art Song Texts Page with texts of selected vocal works.
Joseph Marx Lieder: 20 Songs: Music Web CD review [July 1999] gives example of his compositional style.
Marx, Joseph: Brief biography lauding his vocal works from the Grove Concise Dictionary of Music entry at WQXR radio.