13:00Sarah-Jane CrawfordThe 1Xtra ChartBBC Radio 1Xtra Duration: 3 hours Sat 10th Dec 2011, 13:00 on 1xtraCounting down the biggest-selling tracks of the week in the 1Xtra Chart.GenresMusicHip Hop, RnB & DancehallMusicClassic Pop & RockExperimental & NewBrandSarah-Jane Crawford Source: BBC Online