Alicia Keys is part of a star-studded line-up that will perform at the 12-12-12 concert in New York
She said: "I was born and raised in New York and I was here during everything that happened with Sandy. It really displaced people and devastated people's whole lives".
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The PM promises to double to 200,000 the number of homes built under an existing scheme aimed at easing Britain's housing shortage.
The Met Office has weather warnings in place for snow and ice until 10am in the north and west.
The plan, which would effectively strip banks of the benefit of recent corporation tax cuts, forms part of the party's election manifesto.