I also ski with music. I tend to listen to music that has a rhythm that is compatible with the turn size that is also suitable to the terrain. However, while I do allow the undulations of the slope to dictate many or most of my movements, I do not let it dictate my turn rhythm. Once I choose a turn rhythm for the slope ahead, I maintain that rhythm throughout. Skiing to music has helped me to master this aspect of putting control of rhythm in my hands and removing any influence on rhythm that terrain undulation may have. While I may break that rhythm to make a fall line adjustment, I will return to that same rhythm until I complete the turn series I am on. For music that has a rhythm or beat that is much faster than the turns I am making such as three beats per one turn, I still maintain my turn timing with “every third beat”. Conversely, three turns per beat: same thing. This way, I am not “tied” to lining things up exactly while maintaining timing with music. When I ski without music, I can see the resonant benefits that were developed. When racers are forced to ski to the rhythm of gate position, their skill allows them to maintain this rhythm regardless of slope undulation. In this light skiing to music and maintaining a set rhythm is sort of analogous to running gates. This ability of separation of rhythm and "terrain change influences" stems from good separation of the upper and lower body. Therefore, skiing with music can benefit the separation required to maintain rhythm. Separation is key and worth any hack at it you can get.