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The Blues Scale 2

So the blues scale is a Jazz based Minor Key construct and has nothing to do with true blues music at all.

True blues has an underlying Major sound and is hardly ever truly in a minor key

The Kings Of Lounge play an instrumental version of Sunny Goodge Street by Donovan, referred to at the end of The Blues Scale Explained part 2 video, this piece uses the Blues Scale exclusively for the main melody.
It is in the key of B minor

This Is The Blues Scale