A Brief Guide to Modernism
https://www.poets.org/poetsorg/text/brief-guide-modernism
This link provides an overview of literary modernism.
Freedom Sounds from Smithsonian Folkways
https://folkways.si.edu/freedom-sounds-from-smithsonian-folkways/music/playlist/smithsonian
Smithsonian Folkways provides a playlist of African American spirituals that can give students an idea of the kind of music that influenced Toomer.
A Guide to Harlem Renaissance Materials
http://www.loc.gov/rr/program/bib/harlem/harlem.html
This is the Library of Congress web guide to Harlem Renaissance collections. It is an excellent starting point for research, especially into primary sources.