Lighter
Both Rasmussen and Slade were at one time or another shantymen.
Little information on either but for anybody with the time, opportunity and inclination, the BBC index (copy at Vaughan Williams Memorial Library) has a few interesting notes to their shanties and how they were used.   
"Slade was the very last sailor, starting off in the days of sail, to have served before the mast as a recognised shantyman. It was his recordings that fired Peter Kennedy, and later the BBC, to begin a systematic programme of recording traditional singers and other performers in the UK."

"RASMUSSEN, A.H.        .        
Singer of sea-shanties. Recorded London. 11.4.55.
A Norwegian and a writer, aged: 74. Has functioned as a shantyman during the early part of his life. On 22348 he talks about himself and an adventure at sea; and on 22350, introducing 'Sacramento' he tells how he was elected shantyman."
Jim Carroll