Nicks version was sung while stowing down in Moby Dick. Other versions were hauling whale up to ship & one actually correctly "tossing a bunt". They are there, but you have to listen hard. As for not singing when chasing the whale, rubbish. The splash of the oars on a hard pressed boat aint silent, & fish hear best thru the water, so you don't exactly sneak up on 'em, mate.