Yeah! — Usher ft. Lil Jon & Ludacris (2004)

"Yeah!" stands as the crunk-R&B fusion that dominated 2004, achieving No. 1 on the Billboard Hot 100 for 12 consecutive weeks. Its irresistible call-and-response hook between Usher and Lil Jon drives a production built on a minimalist synth riff, while Ludacris' rapid-fire verse adds raw energy. The song sold over 5 million digital copies, demonstrating its significant commercial impact. "Yeah!" remains a prominent club anthem, and its longevity is proven by its position as one of only three songs from 2004 to rank among the top 50 best-selling digital singles of the 2000s, cementing its cultural footprint. However, its specific blend of genres, while popular, may not appeal to all listeners as a definitive sound of the decade.