It's the backing track for Don't Run Away, a Bruce & Terry track from '66.
Again, while there doesn't appear (?) to be any proper known evidence of such (as far as I know), I'm speculating that possibly, just maybe this was on there for the BB's to attempt to sing/record this song at the time in the 70s?
That may be nonsense, and I'm not trying to spread rumors, but what other reason could there be for this being on there? Do we know who compiled this tape to begin with? I thought from reading on this board that the contents came from a source close to the band in the 70s? Somebody's gotta know!
I got to chat with Bruce last year briefly at the BB's appearance at The Grammy Museum, and I mentioned "Don't Run Away" to him as being my personal favorite lost BB-related gem that rarely gets talked about, and he sang me a couple lines of it. I wonder if other than that, he ever sang this song since the 60s? I think it's in the ballpark of being as good as songs from Side 2 of "Today".