Okay, at least some of these commands look genuine as observed, rather than all made up fun and games. The only slight relation to men singing at their tasks is the use of the word 'Singing' in your last line, presumably referring to the singing out of depths by the man with the lead line. Perhaps if you post the next line we can be better informed on that one. The practice was often referred to as singing which probably stems from the fact that this was such a boring but necessary task and the crew member sang it to relieve the boredom. If it is this, it doesn't relate in any way to call and response, unless other crew members were relaying the depths to other parts of the vessel.