Now that choreographer Twyla Tharp has a Broadway hit, is she selling out? “Sellin’ out might seem a more appropriate label for a career that has advanced so publicly from avant-garde to Broadway. Tharp is even publishing a self-help book on the art of creative thinking this autumn. Yet she hasn’t abandoned her pure-dance audience – her small-scale touring company appears at Sadler’s Wells this week – and it would be foolhardy to suggest to her face that Movin’ Out represents her art’s dumbing down. Nor does Tharp look like a woman basking in easy success…”