When asking a question, please do start by providing at least the basic information we need to help you. Don't make us waste time in guessing what you might be talking about.

Somebody else can provide links to previous Forum discussions and to the DT file. The midi in question is not the tune for (Once there were) Green Fields, but for The Green Fields of Summer (words by Paul Francis Webster, music by Dimitri Tiomkin), which was also recorded by The Brothers Four. It featured notably in the John Wayne film The Alamo.

How it wound up linked to the wrong song in the DT I don't know, but there are many such errors there.