I had a dream last night (not a LD, I’ve never had one) but it was pretty clear for one of my dreams. I was in a big house and there was an angel holding a baby, protecting her. There were birds outside the windows, and they were making this beautiful music. The bars of music appeared on the floor. When I woke up, I realized that the angel & the baby came from 2 different books I’ve read recently. And the birds & their music came from real birds I could hear outside my open window along with my brother practicing guitar in the next room. Anyway, I guess my whole point in posting this is because I can see where my dream came from. Nevertheless, it’s kinda significant that my mind pulled out the angel & baby (which weren’t the main things in either of the books) and put them in such an image that gave me a loving, calm, safe feeling. It was very nice. I think I’ve rambled on enough for now, that’s all! 
Wow! Thanks for posting that, I think that your dream is a very excellent example of the power our mind has to make abstract connections when we allow it to. Out of curiousity, what were the books? 
And when you say “the bars of the music appeared on the floor”, are you talking about the bars of the music as it would appear if transcribed, or a physical object in the dream?