jbaldy: See the Nitei Gavriel on this (I think it’s in his Halachos of the 3 weeks).
WIY: I’ve still yet to see an actual Makor for you “music entering the soul” bit. Do you honestly believe that I could listen to 2 identical songs–with the exact same notes, lyrics, etc.–and yet be positively affected by one but negatively by another because they were written contemporaneously by different people?