Meanwhile, at Queens Market in East London, Muhammad Shahid Nazir was busy doing what he did best: attracting customers to his fish stall by singing his catchy tune One Pound Fish.

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If we get enough of us singing the same song of simplicity, the tune will be so catchy that everyone else will start singing along.

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With their foot-stomping basslines and too-catchy choruses, they were for singing along to after too much to drink, rather than anything to be taken seriously.

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