Usher and Linkin Park were among the winners at the 2004 Radio Music Awards in Las Vegas.
Usher took the awards for hip-hop artist of the year and song of the year for Yeah! at Monday's ceremony.
Linkin Park won the alternative rock song of the year for Numb and rock artist of the year. The winners were chosen by US radio executives.
Performers at the show included Sir Elton John, Destiny's Child, Alanis Morissette and Ashlee Simpson.
Destiny's Child opened the show at the Aladdin hotel and casino with their song Lose My Breath.
Singer Beyonce Knowles won the award for top 40 radio artist of the year, while Tim McGraw won the country artist of the year.
The nominees in each category were based on radio's top-playing songs. Radio programme and music directors across the US voted for the winners.
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