Where to play the "blues scale"?

Simply put, the blues scale in one of the most played scales in all types of music that require some lead guitar playing!

So, where do we play it?  More specifically, over what chords can we play it?

First choice should be any minor chord because of its minor 3rd interval from the root...so play it ins root form over any minor chord (D minor = play D blues)

Second choice should be over any dominant 7th chord because of it b7 interval from the root...(G7 = G blues)

Third choice should be over any other chord belonging to the relative key in which you played the first and second choice above....Example: you decided to play it over a D minor chord (you played the D blues scale)....then, you can use it over any of the chords of the major key in which D is the second, third, or sixth degree.  This choice is bit more intricate, but it also sounds a bit more intricate too!