Here's an inspired duet by Tom Waits and Keith Richards on the song "Shenandoah" from the album Son Of Rogues Gallery: Pirate Ballads, Sea Songs & Chanteys.
Yup, definitely sounds like a bunch of pirates wailing over a pile of pints. Just beautiful.
And if you liked that, here's Shane MacGowan with Johnny Depp and Gore Verbinski with "Leaving of Liverpool" from the same album.