What's the difference between bi-polar disorder and being manic-depressive?

I was taught both are the same thing. Manic-Depressive refers to the symptoms of the Bipolar Disorder.. Is how my old therapist explained it to me, She said that also as the other person stated Manic Depressive was the older term for it, before it was recognized to be a disorder and more then just symptoms. - DNatureofDTrain

i don't know that music