All right, so the Left 4 Dead/Left 4 Dead 2 crossover DLC "The Passing" passed March by. Valve just announced it'll be available for download next week! We're sure the content will still be fresh, and the zombies still putrid, in April! Valve promised to update the official blog next week with more details.

Additionally, in the spirit of crossover ... ing ... ness ... the Left 4 Dead blog announced that two songs by the fictional Midnight Riders band have been added to the Rock Band Network. For just one dollar each, you can play "Midnight Ride" and "One Bad Man!" It would be appropriate to gather three friends to play the songs with.

[Thanks to everyone who sent this in!]

This article was originally published on Joystiq.

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