Lyrics as above:

"…Rowing songs are found, from the fourteenth and fifteenth centuries, in which the word 'rumblelow' frequenty appears—the word also appears in songs sung by water processions which used to be held by the Lord Mayor of London. This has been pointed out by L.G. Carr Laughton and Miss L.A. Smith and others, and D'Israeli in his book Curiosities of Literature writes that, 'our sailors at Newcastle in heaving their anchors (still) have their “heave and ho, rumbelow”', which brings the word down to comparitively recent times. My friend Mr. G. Legman has pointed out that in Skelton's sixteenth-century Bowge at Court there is a song “Heve and how, rombelow, row the bote, Norman, rowe!'

...2. The verses are taken from the Introduction to Capt. W.B.Whalls Sea Songs and Shanties, Brown, Son & Ferguson, Glasgow, 1927”
[Hugill, foreword]