The familiar tune is in the same 'Lazarus' tune family as 'Van Diemen's Land'. It has a once-removed relative in 'Paddy's Green Shamrock Shore' and many other similar Irish songs. Unsurprisingly, it has the Irish come all ye A-B-B-A structure and retains its common time, as opposed to the triple-time treatment of the tune found in numerous musical cousins. It would be interesting to trace earlier melodies, should they exist.