I had to enter a bunch of business receipts into Excel, so I wanted to put something on in the background. I chose Murray Rothbard's address to the 1989 Texas State Libertarian Conference. If you haven't ever seen clips of Rothbard speaking in public, you should definitely let this play for a few minutes, even if it's just in the background. It's always immensely easier to get the tone of someone's writing if you've heard him/her speak.
(BTW he really starts getting laughs in the middle to end.)