I know for a fact Dave (unlike Roger) is very generous with credits on his music. If anyone contributes anything at all to a song, Dave will credit them accordingly. So it is possible that all Polly did in some cases was offer a suggestion for a change of a phrase, or something like that.

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Taking away from you for the greater good. (The Audacity of Socialism).

"Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery".-- Winston Churchill

"Islam isn't in America to be equal to any other faith, but to become dominant" - Omar Ahmad (founder, C.A.I.R.)