Does the softening or hardening of the hard be felt within the physical aspect?
Because whenever I'm listening to music I feel something in my heart beating too fast or stiff. But for example If I reflect, ponder and pray to Allah swt I feel my heart is like being removed from tension, I know hardening or softening of heart is spiritual thing but does one can feel the effect on his heart physically?

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So the softening and hardening of the heart is a spiritual experience. The spiritual heart refers to our capacity to be guided and moved by advice. Now undoubtedly the soul has an impact on the body, so sometimes this can be felt on the physical heart as well.