Great resource for copyright friendly images and sounds for media projects-Joyce Valencia

Creative Commons
DK Clip Art:

Explore thousands of images from leading illustrated publisher Dorling
Kindersley. Perfect for illustrating homework, school projects and
generally being creative, you can browse the clip art by A-Z or by
school subjects. DK holds the copyright but allows users to download,
copy and display the Images for your own personal, home and school use.

Thanks to the generosity of contributors, this site provides thousands
of free pictures, which you can use and remix, even in commercial
applications. Attribution is not required.

Wikimedia Commons:
Unlike traditional media repositories, Wikimedia Commons is free.
Everyone is allowed to copy, use and modify any files here freely as
long as the source and the authors are credited according to the
author’s requirements.

Free Digital is one of the best places on the web to download
free photos for use in corporate and personal projects. The images can
be used by web designers, graphic designers and editors to illustrate
and brighten up websites and printed media such as newspapers and
magazines. Please see the terms of use for more information on
acceptable use of these images.
Pics4Learning is a copyright-friendly image library for teachers and
students. The Pics4Learning collection consists of thousands of images
that have been donated by students, teachers, and amateur photographers.
Unlike many Internet sites, permission has been granted for teachers
and students to use all the images donated to the Pics4Learning

Music: Royalty Free