American Popular Song - From paper presented by Howard S. Becker at a 1994 conference discussing the structure of the standard popular song along with its history, songwriters, musicians, and singers. Bibliography. - http://home.earthlink.net/~hsbecker/pops.html
Wikipedia: Melodic Music - Defines "melodic" genre as the vocal-oriented popular American music style that came after big band music but before rock and roll, as exemplified by singers like Perry Como and Margaret Whiting. - http://en.wikipedia.org/wiki/Musical_genre#Melodic_music
Parlor Songs - Collection of popular and classical sheet music from the 1800's to the 1940's, cover art, audio samples, composer biographies, and articles on the history, styles, and themes. - http://parlorsongs.com/index.asp
Ian Whitcomb's Literary Corner - Includes articles on Rudy Vallee, Duke Ellington, Irving Berlin, and the first crooners. - http://www.picklehead.com/ian/literary.htm
Craig's BigBands and BigNames - Historic reviews and photos from performers of the 1940s, 50s, and 60s. Includes old time radio broadcast, quiz, and message board. - http://www.bigbandsandbignames.com/
AMG: Vocal Music - Overview of the genre, essay, key artists and albums, and recent releases. - http://allmusic.com/cg/amg.dll?p=amg&sql=F0VOCAL