This has been on my list for a long time, and it's now up in the rotation.
Sea shanties are often (but not always) in a nice 3/4. It helps with getting a crew working in synch - tug on the rope at the downbeat, recover and gather the next length for two beats. When everyone hits together the pulls are way more effective.
This is fortuitous also, because we just recently enjoyed this:
Women working together. Set to sea shanties. What could be bad?