Beyonce Knowles has stunned music experts in the US by scoring a 10th week at number one on the singles chart. The singer's IRREPLACEABLE has been just that since it hit the top of the Billboard chart in early December (06), and now the hit song is fighting off major challenges from Nelly Furtado and Fall Out Boy. Furtado's SAY IT RIGHT climbs to number two, switching places with Fall Out Boy's THIS AIN'T A SCENE, IT'S AN ARMS RACE, which became the highest debut in the chart for nine years when it crashed in at number two last month (JAN07). The new chart's highest debut belongs to THE JONAS BROTHERS' YEAR 3000, which claims the number 40 spot.