I want to get some backing tracks for some lead playing, but all the sites I go to it doesn't say a thing about what key it is in. So I'm a bit confused, for example the backing track for The thrill is gone by BB king how do I know what key its in?
My Guitar

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Look up the tab, and work out the key from that, if its backings for actual songs, if its just chord progressions, then it should tell you, otherwise slide up the low E string until you find the matching note to the first chord, and then go from there. Thats how i do it.