A simple summary would have sufficed. All that duplicated chat is hard to dredge through in order to find the relevant details.

A version of the song itself (text only) is in the Digital Tradition database: SAM'S GONE AWAY. That appears to be what it is usually called.

It has been discussed in these past threads:

Info request on Sam's Gone Away (Shanty)

Lyr Req: Sam Gone Away - Shanty

... and further touched upon in

Help: Calling all shanty experts!

That doesn't help much with finding this specific recording, though several recordings of the song are mentioned, and a quck search via Google.com identifies more examples. However, it does establish the usual title; so now we know what the song is, if not who sang it in this particular instance. I got the impression that you had narrowed it down to a group called Hanging Johnny. Did this turn out to be a false lead?