 The classical guitarist has a different set of left hand calluses as the hand of the classical player falls more parallel to the neck and plays on the "front" (nail side) of the fingertip.As a general rule, in classical, if the player concentrates on playing on the front of the third (or ring) finger, the other fingers will follow.To play a note clearly, the fingertips of the left hand should be pressed against the string just behind the appropriate fret.