Weapon: If people are allowed as weapons, then I'd want someone like Jason Bourne or Michael Weston, able to turn just about anything at hand into a weapon for themselves. If not, then I'd want something that would take the zombies down at range. Incendiary missiles might work well, depending on how large and concentrated the zombie population is. If everyone's been turned into a zombie (except for me and my famous person, of course), then I'd want something portable that either won't run out of ammo or has ammo I could make myself.
I feel further research is necessary before I can answer this question.
Music: Bach's Passacaglia and Fugue for organ in C minor, BWV 582. It's one of those pieces that sort of drives forward and just doesn't stop. Also, it's sort of grim, and in general seems appropriate for a zombie apocalypse.
Famous Person: What I'd want is someone who's got a good track record of keeping other people alive. So, going back to my answer to the first question, Jason Bourne doesn't do too well in that category. He got Marie through the first movie, but she died pretty early on in the second, and he lost the journalist dude in the third. Of course, it's really hard to guard against a sniper, and the journalist dude freaked out and stopped following instructions. Also, Jason's got a really good record of killing people, which might translate well to killing zombies. Depends on the kind of zombie.
Michael Weston, on the other hand, has a really good record of keeping people alive. Also, he's even better at McGyvering than Jason, which is sure to be a bonus in the post-apocalyptic world. He's a better conversationalist, too.
Hm. Can't choose between the two at the moment--either would do the job. There're probably people who'd be better at killing mass quantities of zombies, but continued survival is the most important thing, in my opinion, and both are very good at that.
ETA: Actually, the best person to have on my side would probably be Sabriel (from the Abhorsen series by Garth Nix), since she can actually control zombie-type things and kill them permanently.
So, what/who would you guys choose?