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Jay-Z/Linkin Park

Obstacle 'Course'

ParkJay-Z and Linkin Park's July 18 concert at Los Angeles' Roxy Theatre is the subject of the first episode of "MTV Ultimate Mash-Ups" and the CD/DVD "Collision Course." The CD/DVD is due this week via Warner Bros./Roc-A-Fella.

The CD portion of "Collision Course" features studio recordings of the songs blended together at the Roxy show, including "Numb/Encore," "IZZO/In the End," "Points of Authority/99 Problems/One Step Closer" and "Dirt off Your Shoulder/Lying From You." The sessions were produced by Linkin Park's Mike Shinoda.

"The biggest challenge in recording some of the new vocals was singing our dark lyrics over Jay's music," says Linkin Park's Chester Bennington. "Some of his songs felt happier than our songs -- which made for a different attitude in our vocals."

The DVD features the full Roxy live show and a behind-the-scenes documentary of the acts preparing for the gig, plus MTV's broadcast version and a photo gallery.