Until this month, download sales could only count towards a chart position if it was also available to buy in stores.

But a change in the rules has enabled download sales to be considered - as long as physical copies of the single go on sale the following week.

One retailer, HMV, said it was its fastest-selling music download ever.

Gnarls Barkley consists of two Americans - producer Danger Mouse (aka Brian Burton) and hip-hop artist Cee-Lo Green, aka Thomas Calloway. Their song has been in demand since featuring in BBC TV promotions for Zane Lowe's Radio 1 show.

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