Chicago's DJ Casper has knocked Britney Spears off the top of the UK singles chart with Cha Cha Slide, a song he wrote in 1996 as an aerobics workout.
Katie Melua continues to top the album chart
Spears' Toxic falls to two after just one week at the top. Jennifer Lopez has this week's highest new entry, Baby I Love You entering the chart at three.
Peter Andre's Mysterious Girl is at number four, while Enrique Iglesias with Kelis is at number five.
Call Off the Search by Katie Melua remains on top of the album chart.
As artists aimed at younger record-buyers continue to dominate the singles chart, the album top ten has this week been ruled by jazz or easy-listening records.
New York jazz singer Norah Jones' second album Feels Like Home was at second place in the chart, with Irish crooner Daniel O'Donnell beating jazz sensation Jamie Cullum to third place.
Over 40s increase
At fifth was veteran soul and easy listening singer Lionel Richie with his new record Just For You.
At sixth place was Harry Connick Jr - a singer once dubbed the new Sinatra - and at seventh venerable lounge legend Engelbert Humperdinck.
Newspapers had predicted the adult-oriented top five, which they said reflected the rise in album buying by people over 40.
People aged between 40 and 49 buying more albums, from 16.5% in 2000 to 19.1% in 2002, British Phonographic Industry figures showed last month.