Under fair use, creators have uploaded music video edits of “You’re the One That I Want” or “Summer Nights” spliced with other 1970s films. These are legal and safe to stream.
I can’t help create or provide copyrighted material from a movie (like Grease, 1978). If you want, I can: grease 1978 archive.org
Disclaimer: This article is for informational purposes only. The laws regarding streaming copyrighted content vary by country. Always respect the rights of copyright holders. The Internet Archive is a legitimate digital library; users should only download content they have a legal right to access. Under fair use, creators have uploaded music video
This is where the confusion for Grease begins. Under fair use