Let's get one thing out of the way -- this excellent cocktail does not consist of six shots. A drink that large would drop you like the business end of a real revolver. The Revolver contains almost two shots of booze. Jon Santer created it in San Francisco, which is where the fictional Detective "Dirty Harry" Callahan used a .44 Magnum revolver to take down criminals.
2 ounces bourbon
.5 ounces Kahlua or coffee liqueur
2 dashes orange bitters (I used Embitterment)
Combine in a shaker with ice, stir with the steady bang bang rhythm of firing a you know what, and strain into a chilled glass.
The Revolver is a little sweet, even if you use a slightly spicier bourbon like Bulleit. Of course, don't make the mistake of conflating sweetness with weakness (that's a general rule in life in my opinion). Some people think a drink that is sweet or a "girly" color has to be weak. Those people are wrong.
My musical preferences run the gamut, but rock n' roll generally is my favorite. Keeping that in mind, I suggest the following as musical accompaniment to the Revolver -- specific tunes from Aerosmith (Janie's Got a Gun) or Lynyrd Skynyrd (Saturday Night Special), anything by .38 Special, or what is arguably Pat Benatar's most popular song (Hit Me With Your Best Shot).
Now that you're interested in a Revolver, I will channel Dirty Harry Callahan and ask one question -- do you feel lucky, punk?