Free selection of music for use in videos with attribution. Safe for use on YouTube. (Filter to "Free Music Only")
Additional information and restrictions listed on their website.
Available for free with credit to the creator. More information about their license can be found in their FAQ page: https://incompetech.com/music/royalty-free/faq.html
The Free Music Archive contains a large collection of music released under Creative Commons, Public Domain, and other licenses. When using music from FMA, make sure to click on the album title for full copyright information.
"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."
Many Flickr users have chosen to offer their work under a Creative Commons license, and you can browse or search through content under each type of license.
Pixabay has free to use stock images, vector images, and videos. See their Terms of Service for licensing restrictions: https://pixabay.com/service/license/
Next Vista For Learning provides a library of free videos made by and for teachers and students everywhere.
All content is licensed under Creative Commons Attribution.