Yeah I have ran into the versions that have been re-recorded by sessions musicians & there are some that are really good, but you can immediately confirm that these particular BT's are "covers" of the original version.. The songs that I'm curious about are "clearly the original versions" & when compared to the original versions there's zero doubt that they're coming from any other audio source..
I linked another good example that is without a doubt coming from the original recorded version.. I've heard this song literally thousands of times over the years & after a very close comparison I can say without any doubt that it's definitely coming from the original recorded audio.. During the intro, as well as a few other key points of the song, the original guitar parts surface as a guide during the intro & lead guitar parts.. Every instrument is a perfect audio match to both the vinyl & CD versions of this particular song..
https://www.guitarbackingtrack.com/p...oting_star.htm
I just can't see how they're doing this outside of having access to the original masters, which would require a lot of "$$$" for the license of each & every song they converted to a BT.. Being that they're openly taking requests & just giving it all away for free it's clearly a rogue service so I can't see them paying for legit licensing.. LOL