The ARIA Singles Chart ranks the best-performing singles in Australia. Its data, published by the Australian Recording Industry Association, is based collectively on each single's weekly physical and digital sales. In 2009, 14 singles claimed the top spot, including Lady Gaga's "Poker Face", which started its peak position in late 2008. Seven acts achieved their first number-one single in Australia, either as a lead or featured artist: Jessica Mauboy, The Fray, Taylor Swift, A. R. Rahman, Nicole Scherzinger, David Guetta, Vanessa Amorosi and Kesha.