Personally, I think the whole thing has gotten out of hand.
I can see copyright on samples, no matter how short. But a few words in an entirely different song? Come on.
But then, I am not the person who makes the laws.
Like I said, there is a long tradition in quoting others works in classical, folk, jazz, and pop recordings. As long as it doesn't interfere with the sales of the work quoted, I don't see a problem, and embrace the practice as homage.
Insights and incites by Notes