If you need the music you can find midis with lyrics at my Songs of the Sea (http://www.contemplator.com/sea.html) page. It will also give you some of the stories and history behind the shanties (which reminds me I have stuff to add on Paddy West.) There should be several there to suit.

As sailors often added their own verses it might be fun to have the kids make up some of their own too! You could have them make up their own verses to Leave Her Johnny (if they get some background into how hard life was on a sailing ship). Or to illustrate how shanties took on a life of their own you could have them think about how much they *like* about school - school food for instance, and put those sentiments into Leave Her Johnny...

I also agree with Sean, clean them up to suit your needs as well. Most of the authors of the books I took the shanties from cleaned them up for their works!

Have fun!