   the billboard hot 100 is a chart that ranks the best-performing singles of the united states. published by billboard magazine, the data are compiled by nielsen soundscan based collectively on each single's weekly physical and digital sales, and airplay. in 2005, there were eight singles that topped the chart in fifty-three issues of the magazine. this is the second lowest number of singles to top the chart in a single year ever, just behind 2002. during the year, five acts achieved their first us number-one single, either as a lead artist or featured guest: chris brown, mario, olivia, gwen stefani, and carrie underwood. stefani earned her first number-one single in the united states this year, although she had been with band the no doubt since 1986. hip hop artist kanye west gained his first number-one single, "gold digger", as lead artist; west previously had a number-one single with "slow jamz", a 2004 song by rapper twista. two acts, underwood and brown, scored a number-one debut single this year. r&b singer mariah carey's "we belong together" is the longest-running single of 2005, topping the billboard hot&nbsp;100 for 14 non-consecutive weeks. to date, it is tied for the longest-running number-one single of the decade,{{cite news|url=http://www.billboard.com/articles/news/61641/chart-beat-chat|title=chart beat chart: still together|last=bonson|first=fred|date=2005-08-26|work=billboard|publisher=nielsen business media, inc|ac
2005_record_charts Lists_of_Billboard_Hot_100_number-one_songs