Yoko Ono Sues "Expelled" Filmmakers About Use of "Imagine"
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John Lennon's widow, Yoko Ono, and his sons are suing the filmmakers of "Expelled: No Intelligence Allowed" for using the song "Imagine" in the documentary without permission.
One key question is whether the use is "fair use."
You may want to consider the Documentary Filmmakers' Statement of Best Practices in Fair Use, and specifically page 4.