Crafting Character through Music

When I approached my novel, IN THE POISON GARDEN, I only had the main character Roxanne in mind, though I ultimately felt that a whole cast of characters would be best to fulfill my creative vision. This felt like an intimidating, and nearly impossible task. While writers hew personas from shapeless marble all the time, to date I had mainly focused on one or at most two main characters. I asked myself, could I use music and song to alter my perspective and get into the right headspace to create more and different characters?