I have a strong hunch that music has a profound emotional effect because we can use the same kind of signal decomposition to encode both emotionality and musicality. Of course, I have no evidence for my claim.
This is a hypothesis put forward by Gerald Langner in the last chapter of “The Neural Code of Pitch and Harmony” 2015. I personally think he was on to something but sadly he died in 2016 before he could promote the work
