Can you supply more info, it looks like it would be Haul instead of All & with the 2 refrains it would probly be a halyard shanty, but Billy is very uncommon in the chourses of shanties, a few Billy Boy or Billy Reily & last names (instead of nicknames) are even more uncommon (Billy Reily), but O'Shea I've never heard, I just looked through Hugill & Doeflinger & couldn't find anything close, maybe you've got something that's been written recently. Post more info if you can & if you find it, post it, it sounds like it could by an interesting shanty. Good Luck.