Hey there! Welcome to Dream Views, even though I haven't been here all that long myself.
Sounds like a bit of a nightmare. Is this your first lucid dream? I figure it isn't, because you describe yourself as a "lucid scholar". I found when I was trying to induce a WILD about a week ago that music also kept playing in my head, unconsciously too. I guess it has something to do with the brain recalling the experiences of the day- did you listen to music during the day, like in the car or anything?

Hope you have better dreams in the future