Universal's Number 1 Hits from the Noughties rounds up 41 hits from the decade, including ubiquitous radio earworms like "Who Let the Dogs Out" (Baha Men), "SexyBack" (Justin Timberlake), "Beautiful" (Christina Aguilera), "Hey Ya!" (OutKast), and "Toxic" (Britney Spears). ~ James Christopher Monger
