Heartily agree with "Crane Driver", but will of course add that there are wrong ways to sing a shanty, and that IMHO most are sung too fast. You try haulin' on a rope or runnin' a capstan round to the speed what some folks sing at !!! Running Down to Cuba is in Hugill, but my copy is out on loan, so I am without his printed version. Sing any damn thing you like, son. But sing it loud.