My recommendation is the Dreadnoughts. "Roll Northumbria" is an old style shanty about a modern day oil tanker. Hands down best introduction to the group. https://www.youtube.com/watch?v=-d3XHQVMHDM

"Dear old Stan" will have you randomly chanting "Arise and be Merry" at random intervals throughout the day. https://www.youtube.com/watch?v=YHpizfjWrXA