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Hard rock Hardcore punk Hard Candy (album của Madonna) Hardwell Hard to Say I'm Sorry Hard Rock Cafe Harder, Better, Faster, Stronger Hard house Hard Target Hard (bài hát)Tài liệu tham khảo
WikiPedia: Hard_(bài_hát) http://pandora.nla.gov.au/pan/23790/20100205-0000/... http://www.billboard.com/charts/year-end/2010/hot-... http://www.billboard.com/charts/year-end/2010/hot-... http://www.riaa.com/gold-platinum/?tab_active=defa... https://www.billboard.com/music/Rihanna/chart-hist... https://www.officialcharts.com/search/artists/Riha... https://swedishcharts.com/showitem.asp?interpret=R... https://charts.nz/showitem.asp?interpret=Rihanna&t... https://web.archive.org/web/20140621100846/http://... https://web.archive.org/web/20160415124842/http://...