While having lunch today, the music system played this tune by some orchestra - no vocals. It was in waltz time, which kind of threw me. I asked my wife if she recognized it, and she came up with the phrase "green leaves of summer", and I knew instantly that that was the title of the song. I was thinking that it sounded like something from a movie like DR. ZHIVAGO, and it turns out that it was from a movie - THE ALAMO. The waltz time gave it a different characteristic.
So, looking it up, I found that the original movie version was a waltz, but that both Herb and the Brothers Four chose to use 4/4 time. The song has stuck with me all afternoon and into this evening. I usually overlook it on VOLUME 2 as just a slow song, but it really is very pretty, and obviously has lodged itself in my head.