Biography noting his place in and influence upon Danish vocal music from the Grove Concise Dictionary of Music entry at WQXR radio.

Filmography linked to the Danish film Der var engang from the Internet Movie Database.

Listing with The Lied and Art Song Texts Page with Danish and German lyrics and some English and French translations of selected vocal works.

Brief biographical sketch naming him as one preparing the way for Debussy. With Naxos discography.

Entry with the Online Music Research Library of Denmark. Includes bibliography, photograph, music samples in MP3 and SMIL formats, and works list.