She says that in great music, one of her secrets is to vibrate between the notes! Its pretty self evident that we spiritual beings respond to certain frequencies of vibration more so than other frequencies. We seem to have our own natural vibration.
Musical vibrations can cover a large gamut of the range of human emotions. Rhythm is a very powerful force, especially in dance. The music one likes best probably vibrates closer to a being's natural vibration than music he doesn't like. The composers, orchestras, bands, instrumentalists and vocalists which people like best probably reflect best their native vibrations or perhaps even better can get people to vibrate at new frequencies which they were previously unaware of.
Helene Grimaud talks about vibrating between the notes and if one can achieve that, one's sense of music can be greatly expanded.