Welcome to Music Banter Forum! Make sure to register - it's free and very quick! You have to register before you can post and participate in our discussions with over 70,000 other registered members. After you create your free account, you will be able to customize many options, you will have the full access to over 1,100,000 posts.
In high school, I knew some retarded goth kids that insisted The Beatles ripped off Charles Manson.
Fun story, but they were almost correct. It was The Beach Boys who ripped off Manson. Seriously. Dennis Wilson met Charles on a trip, who played a song for him, which he decided to take as his own.
Here's the original:
Here's the "cover":
I'm too lazy to cite my sources, but it's a pretty well known incident, so it shouldn't be hard to find if you want to look into it.