<P> This article is about the American Billboard Hot 100 chart held during the 1990s . </P> <P> The Billboard Hot 100 chart is the main song chart of the American music industry and is updated every week by the Billboard magazine . During the 1990s the chart was based collectively on each single's weekly physical sales figures and airplay on American radio stations . </P> <Dl> <Dt> Key </Dt> <Dd> ♪--Number - one single of the year </Dd> </Dl> <Dd> ♪--Number - one single of the year </Dd>

List of billboard hot 100 number-one singles of the 1990s