“I read that Don Henley scours the internet, threatening with legal action music reactors who react to Eagles songs.”
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True. God forbid you try to cover an Eagles song on YouTube, or react to any of their songs. They won’t just make you take it down, they will seek to shut your site down and punish you.
Contrast that with the Grateful Dead/Dead & Co., who welcome people to tape their shows and trade them on the internet.
“They won’t just make you take it down, they will seek to shut your site down and punish you.”
Who is the “they” here? Is it just Henley, him plus others who were in the group over time, the estate (Glenn Frey), a corporation? Henley seems like a major stirrer-upper in general, while the others don’t seem so much so. (Of course, I don’t know them.)