Thread drifting a bit, but just for fun, during lockdown, and also in memory of Tim Brooke-Taylor on the radio programme "I'm sorry I haven't a clue", a friend (known here as Scabby Doug) challenged his Facebook friends to "sing one song to the tune of another". Quite a few people had one or two goes at it, but one particular friend, Pauline Vallance, produced a whole concert's worth of these - all very good, and drawing on tunes from folk, classical, jazz and other genres. All very entertaining stuff!

Back on topic, and responding to Guest: yes, a lot of songs share the same poetic meter/no of syllables per line, so tunes can easily be interchanged. Yet another friend wrote a new song and was looking for a tune for it - she was thinking of using the "Tramps and Hawkers" tune, but I gently suggested she might like to find another, as that tune is already used for a number of songs other than T & H.