After years of cultish acclaim and enthusiastic reviews, the American singer-songwriter and star of New York's “anti-folk” scene Regina Spektor has now reached a career tipping point where mainstream acceptance beckons - and her detractors begin to sharpen their knives. She is, depending on your taste, either an idiosyncratic, piano-charming genius, or a contrived and slightly irritating kook cut from similar cloth to that of Tori Amos. With her heavy red lipstick and mane of auburn hair she even looks like her.