Two songs presented as one?

[jesus2099]

@jerry1970, here is a Bowie illustration of both possible cases:

Work 1984/Dodo (I like to emphasise the lack of spaces, here) is an assemblage of 1984 and Dodo with slight lyrics change.

Works Sweet Thing / Candidate / Sweet Thing (reprise) are often played in this sequence but medley recordings are linked to three works (in appropriate order).

I think for 1984/Dodo, it’s because of the slight lyrics change that I created a new work for it.

There is a discussion about concurrent concepts of medley works on one hand and recording-work medley relationships on the other hand:

Question: Approach for medleys

Since there is a “{work} is a medley of {work1}, {work2}…” relationship, I assume there are situations where the medley itself needs a work entity to be created. But there’s also a “{recording} is a medley including a recording of {work1}, {work2}…” relationship. So when do I need to create a medley work, and when is it good enough to link a medley recording with the works it includes?