It's not exactly a sea shanty, but see if you can get Brett and Wakana to do their duet of "I've Been Working on the Railroad" - wonderful harmony and two different languages simultaneously! Wakana says the plot (such as it is) is a bit different in the Japanese version, though it is still about a railroad.

Truly a marvelous weekend (though I could use a weekend to recover from it - as could Charley - he doesn't usually misspell my name....

JudyB