These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Covered Up: Wolves of the Sea is a cover of a song by Pirates of the Sea.
Ear Worm: The violin/Accordion section of Keelhauled.
Narm Charm: Yes, they dress up as pirates on-stage. The singer has an extremely cheesy pirate voice. It's awesome. Their songs range from pirate-themed ballads to epically silly songs with lyrics like: