I thnk you meant Chords and not codes. I'll try to keep this simple and not use music terms you not be familiar with. But a chord is an organization of musical notes arranged together to sound a...
Because we're too lazy to study maths, to summon spirets and cos we haven't anything better to do
to control ones depression,to monitoring child developmaent,to advertise,to entertain,and its a good way of spending time.
I study music for the sheer joy of it.
To sooth your body.