The seemingly odd pairing of a multiplatinum artists from the rap and rock worlds takes an underground concept to the pinnacle of the mainstream as "MTV Ultimate Mash-Ups Presents Jay-Z/Linkin Park: Collision Course" bows atop The Billboard 200 this week. The Warner Bros./Roc-A-Fella CD/DVD set sold 368,000 copies in the United States, according to Nielsen SoundScan.
