Chas & Dave. Mustn't Grumble. Chas \u0026amp; Dave. Darf nicht Grumble.
... it yourself Mustn't grumble, mustn't grumble Mustn't grumble, don't worry 'bout nothin' my friend Mustn't grumble, 'cause all's well that's well in the end Mustn't grumble, grumble
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