OK, I should have checked out those METV versions. Here's the scoop on the promos I was able to find:
Don Gibson sings the Vernon Dalhart tune to Streets of Laredo I mentioned in the previous message.
Tom Roush sings the Lomax / Burl Ives standard Cowboy's Lament tune.
In short, no new or different tune here.
But those are the two singers that (so far as I can tell), were featured in the promos. Help, anybody knowledgeable about METV, do you know if there are other METV promo performers that sing other, different tunes to this song?