I often have music in my dreams. I specifically remember one dream, where i am with my class on some bus trip. One of my classmates begins singing this song, or rather 'humm’ing it. He stands up and asks “Has anyone heard [songs name]”, and I know i have, but I don’t say anything. I’m really close to remembering that song, but alas.
There are also some times when songs i recognize play on the radio.