Thanks cnd.

My problem is it is a lot more difficult to compare tunes by listening to one and then the other. It's a lot easier playing Spot the Difference between two pictures and between two tunes, IMHO.

I can hear similarities with your two suggestions, but ...

The more I listen to the style of Tune 5, the more I think it might be a hymn or sacred song. The second and third last notes have middle C added which is not in the pianist's version on the MIDI files, but listening to that ending on the clock it definitely has a hymn-like quality.