I once had a lucid dream in which I attended a music concert, and the music was very beautiful, catchy, with complex professional arrangements; unlike anything I had ever heard before. Since it was a lucid dream, I felt proud that I could synthesize such cool music. But when I woke up, I couldn't remember anything to recreate it. This made me wonder, was the music truly that beautiful, or had I merely hallucinated my emotional response to it?