Im confused, is a standard 12 bar blues major or minor? Most people I hear use minor pentatonic  but that's apparently only because the tension of the minor third against the major third of the chord is a really bluesy sound. Does that mean a blues is major then? If minor pentatonic is used for tension? Or does it mean its minor? 
it's a lot like messy hair. is it going to the right or left? too cool to tell, for sure