I've not gotten any good at writing descriptions since I first made my tumblr and by god I'm not about to start now.
Unsolicited info-dump incoming:
That Stan Rogers song is an absolute banger, but not a sea shanty! A shanty is a work song, specifically one that can be used to coordinate physical efforts like lifting anchor or hoisting a sail.
With "The Last of Barrett's Privateers," it's not clear what musical cue (if any) you would hoist a sail on. The Spongebob Squarepants theme, on the other hand--definitely a sea shanty.
(I don't expect you to remove the "sea shanties" hashtag or anything, just thought it was interesting and wanted to share)
fun fact this song sits exactly within the most reliable part of my brand new singing range post-T