A humorous AMV cross over. Its a mixtured of Cowboy Bebop and Trigun. The story line goes that the Cowboy Bebop crew watch the bounty show and see Vash on it, the prize is huge! Thus Spike and his gang decide to hunt him down! Its a must see if you like both the animes, but even if you know nothing of either its a great video. Not made by me, its from AMV.org.
Very end of the AMV has the credits, including the song information.