Last legs... &c &c...

Chantey...
Deciding what to leave in; what to leave out, will not have the benefit of the word “chantey,” nor any normative reference definition(s) thereof, until the classic chantey era itself has, mostly, gone the way of British whaling.

Commercial...
Whalers are commercial maritime. Up to c.1855 I get 2 whaler references and 700+ for everybody else and state navies. Whalers and clippers, otoh, about the same. Pick a trade, any one trade, and it will lose v. the sum of all trades minus your one. With a hyuuuge asterisk for...

Error...
A majority of inspection error versus a margin. The total sources that can not be sorted in any way might tip the scales to any one service many times over if “perfectly observed.”

Sources...
Opportunity for observation, documentation and retrieval will be anything but equal and stable for all trades and eras. Passengers increase the likelihood of something getting seen & recorded. Operating offshore for months on end does the opposite. Industrial scale reproduction and distribution, and institutional retention of the sources, will greatly favour the second half of the 19th century over the first.