When listening to music, tune into sensations and observe how the body responds. There might be certain postures and movements that it naturally assumes, along with certain “micro movements” of the spine, fingers, etc. Pay deep attention to the subtle sensations along with any thoughts or emotions that may come up.
Like in the practice of any “technique,” if you approach the above without deeply feeling into the sensations, the mind will begin to quickly wander from its connection with the subtle vibrations.
Tuning into the “Life Force” moving through the spine is like connecting with music. Just as music can hold the body/mind in its resonance, so the Life Force (felt as Bliss) holds the mind/body in its dynamic vibration.
Mind then becomes like fingers of the hand. Just as fingers/hands can hold and grasp whatever it latches onto, so the mind can latch onto feelings, sensations in the body. The mind can hold/embrace such subtlety of vibration in its attention, playing/dancing with sensations that are like micro-threads of finest light being pushed and pulled through the body and brain. The experience of the body is then like a most delicate feather vibrating in a gentle wind!