Question: What song by Usher was released as the lead single on his fourth album, pushing back his originally planned lead single, Burn?
Sentence (from "Yeah! (Usher song)"): It also features guest vocals from Lil Jon and Ludacris, with the former also producing the song as well as incorporating crunk and R&B—which he coined as crunk&B—in the song's production.
Relevant evidence: No