Yeah Munkle I get that all the time. Im a big Music Lover myself and I know exactly what you're referring to. Like about a week ago I had a non- lucid dream but while the dream was going there was this one song playing in the background. Now I know for sure that I never heard this song before but I knew it was a HIT! I mean the lyrics, melody, and everything else was perfect. And I am Positive this song doesn't exsist anywhere, and that I never heard of it before. But it happens alot.