I made the exact same mistake!! I looked back at it and literally slapped my forehead because I was looking for that exact answer and couldn't find it.

I listen with music, just because I love studying with music. However, the idea that you are more likely to remember something if you're in the same mental state (emotionally, physically) as when you were studying does sit in the back of my mind. Just something to think about. Maybe try once without music and see if it affects your BR at all? I, personally, will get insanely distracted if I don't listen to music so it helps me.