She found fame thanks to The OC, but Imogen Heap looks like she's just stepped out of Sleepy Hollow. Dressed in a black lace top, her dark hair piled into a flower-adorned nest on her head, she has skin as pale as moonlight and her love-life as bleak is as a Bronte's.

Eccentric, emotive and deftly picking at the shiny bank of machines, Heap has the dubious honour of being the first download diva. Dismissed from electropop band Frou Frou, Heap went it alone, writing, producing and re-mortgaging her flat to fund her latest album, the appropriately named Speak for Yourself. Following Hide and Seek's airing on the teen drama's climatic season finale, Heap found success both in the US and back home in the UK.

She's still reeling from the fairytale. "I'm so excited," she squeals. "Gone are the days when I have to tell the audience to be quiet." Watching her switch deftly from the bass and beat box of Say Goodnight and Go to the lilting piano of Frou Frou's Let Go, it's impossible not to be stunned into silence.

Like Tori Amos, Heap uses her voice as an instrument, letting it stumble, soar and shriek at will. But she's got a pop heart, playful spirit and a gift for catchy choruses - though not even her vigorous dancing can hide the fact Daylight Robbery sounds like Republica.

Lyrically insightful and devoid of the kooky quality her get-up suggests, she is dominant then submissive in Come Here Boy, but still ends up alone. The Moment I Said It is an excruciating account of an early-morning argument, Heap's high voice rising passionately until she gives up with a childlike "bye bye". Fads and suds got her here, but Heap's talent means she'll stay.