It is quite very simple, just listen for the bass note as it collaborates with the melody, hum it all the way! when you are resting, listen to it over and over, learn it in parts/pieces. The more you spend time doing this.... the better or more efficient you will become,(starting out, of'coarse!), through time and hard work....you my friend, will become a force to be recond with! Its just like singing, "you simply HEAR and PLAY"!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!