The song of Hyrule field, if they do make one like this, should be very long. The part of the song that you hear depends on the time of day. For example, if you're in Kakariko village at noon in Hyrule and you step into Hyrule field, the music will start in the middle of the song. Night should have a song too. The night song in
TP sounded like it had "oohs" but those were not words. In a great fairy fountain, I think the great fairy should be singing words and perhaps the smaller fairies could be accompanying her. It may be voice acting, but it would be appropriate.