How could I play an animation and change the angle of it's joints at the same time?

When a body part (like a head) is used in an animation, all of the Motor6D's attached to it are overridden and do not work. Is there some way to use the DesiredAngle of a part while it is in animation? For example, I have a script that rotates the head based off of where the head is looking at using its Desired Angle, but there I also have an animation playing of the head where it bounces side to side. Is there some way to keep using the desired angle even when an animation is still playing? Thanks in advanced