Variables in credits

[Rahmerh]

Hey!
I'm still far from done with my custom story, but I was wondering about doing something fun with the credits. I was thinking about having some easter eggs/collectibles in the game. Would it be possible to have something like this in the credits:

"Potatoes found: 3/5"

And if they find 4, it'd be "4/5".
I know the credits are in the extra_english.lang, so you probably can't reach it, I was just wondering if there's a trick for it.

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Also, a question about something else.
I want to have some violin music from the 1800s in my custom story. Can I just download the music and put it in? I don't think I have to credit the author, since he's been dead for 200 years... Can I just use it?