This guide offers basic information on using images and media in research. Reasonable use of images and media in teaching, course papers, and graduate theses/dissertations are generally covered by fair use.
Audio Library is a channel dedicated to search, catalog, sort and publish No Copyright Music, Vlog Music Royalty Free Music, and sounds for content creators
Freesound aims to create a huge collaborative database of audio snippets, samples, recordings, and all sorts of bleeps, ... released under Creative Commons licenses that allow their reuse.
Archive contains nearly 1,000 individual pieces of sheet music; scores; collections of short pieces (also called photoplay albums); cue sheets; instruction manuals; and more. See the 'How to Cite' section of the website for proper attribution.