This page is designed to help you think through whether you can reuse someone else's material.
Using someone's text:
Using someone's Photos and Images:
Using someone's Composition:
What about using a facsimile of a composition?
Since a copy of a composition does not contribute any original creative content, the copyright of the composition remains with the original composer/publisher of the piece. If someone took a picture of the Mona Lisa, the photographer would not obtain copyright privileges of the Mona Lisa just because he took a picture of it. The same remains true of a facsimile of a composition.
Using someone's Sound Recording:
Sampling someone else's recordings or compositions: