In an effort to get more specific, I'd like to look at the recordings as they emerged chronologically (in batches). I'll use the info from Reinhard's discography, supplemented with Lighter's notes in this thread.

My prediction is that, in each new batch, we'll be able to see an influence on Lloyd and MacColl, from either a song collection or an individual performer.

I am just going by my ears of what I hear, and comparing it to what I've seen. Just looking at their performances. But perhaps Jim's wish to see specifics about what was said about each song (in liner notes) can also be satisfied.

The broad overview of batches, introduction of new material, looks to have been as follows. The idea is that other albums reissued stuff, and these were the first appearances of new material. Please feel free to correct.

1. The Singing Sailor (1954/55)
2. The Black Ball Line (1957)
3. Thar She Blows (1957)
4. Blow Boys Blow (1957/58?)
5. A Sailor's Garland (1962)
6. Sea Shanties (with Roy Harris) (1974)
7. MacColl's stuff with Critic's Group (6 shanties that I know off) -- please date