im not sure what exactly you're asking about, but some people play exactly what people say, when they play.............this is cool, but not for all songs! now if someone is singing the melody, you can play the other inversion of the chord which will give the melody being sung a type of bed! and i call it balance!!!!!!!!! now this is what i do!!!!!!!!!! hope this helps! and the way you can tell difference is in the highest note being played! when you play melody, it will stand out, but when you play an accompanyment chord, it will harmonize! betta! try it! just invert the chord your useing to follow the melody, it's just an idea that will give you a little more dynamics to your playing!!!!!!!!!! gieres!!!!!!!!!!!!